This series contains a couple easy cleanups for the device handler
infrastructure. I think some more work could be done in the longer run,
e.g. by using a class_device interface to attach to the scsi_device,
similar to how the /dev/sg devices work.
We need to grab a reference to the module before calling the attach
routines to avoid a small race vs module removal. It also cleans up
the code significantly as a side effect.
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh.c | 31 ++++++++++++++++++++---------
drivers/scsi/device_handler/scsi_dh_alua.c | 4 ----
drivers/scsi/device_handler/scsi_dh_emc.c | 4 ----
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 4 ----
drivers/scsi/device_handler/scsi_dh_rdac.c | 4 ----
5 files changed, 22 insertions(+), 25 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 33e422e..1a8dbf3 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -102,23 +102,36 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
if (sdev->scsi_dh_data) {
if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
- err = -EBUSY;
- else
- kref_get(&sdev->scsi_dh_data->kref);
- } else if (scsi_dh->attach) {
+ return -EBUSY;
+
+ kref_get(&sdev->scsi_dh_data->kref);
+ return 0;
+ }
+
+ if (scsi_dh->attach) {
+ if (!try_module_get(scsi_dh->module))
+ return -EINVAL;
+
err = scsi_dh->attach(sdev);
- if (!err) {
- kref_init(&sdev->scsi_dh_data->kref);
- sdev->scsi_dh_data->sdev = sdev;
+ if (err) {
+ module_put(scsi_dh->module);
+ return err;
}
+
+ kref_init(&sdev->scsi_dh_data->kref);
+ sdev->scsi_dh_data->sdev = sdev;
}
return err;
}
static void __detach_handler (struct kref *kref)
{
- struct scsi_dh_data *scsi_dh_data = container_of(kref, struct scsi_dh_data, kref);
- scsi_dh_data->scsi_dh->detach(scsi_dh_data->sdev);
+ struct scsi_dh_data *scsi_dh_data =
+ container_of(kref, struct scsi_dh_data, kref);
+ struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
+
+ scsi_dh->detach(scsi_dh_data->sdev);
+ module_put(scsi_dh->module);
}
/*
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index e99507e..45b1795 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -866,9 +866,6 @@ static int alua_bus_attach(struct scsi_device *sdev)
if ((err != SCSI_DH_OK) && (err != SCSI_DH_DEV_OFFLINED))
goto failed;
- if (!try_module_get(THIS_MODULE))
- goto failed;
-
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
@@ -901,7 +898,6 @@ static void alua_bus_detach(struct scsi_device *sdev)
if (h->buff && h->inq != h->buff)
kfree(h->buff);
kfree(scsi_dh_data);
- module_put(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", ALUA_DH_NAME);
}
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 8476538..153b4c3 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -692,9 +692,6 @@ static int clariion_bus_attach(struct scsi_device *sdev)
if (err != SCSI_DH_OK)
goto failed;
- if (!try_module_get(THIS_MODULE))
- goto failed;
-
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
@@ -728,7 +725,6 @@ static void clariion_bus_detach(struct scsi_device *sdev)
CLARIION_NAME);
kfree(scsi_dh_data);
- module_put(THIS_MODULE);
}
static int __init clariion_init(void)
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 4ee2759..367e6f5 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -377,9 +377,6 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED)
goto failed;
- if (!try_module_get(THIS_MODULE))
- goto failed;
-
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
@@ -406,7 +403,6 @@ static void hp_sw_bus_detach( struct scsi_device *sdev )
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
- module_put(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME);
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 1b5bc92..b850954 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -878,9 +878,6 @@ static int rdac_bus_attach(struct scsi_device *sdev)
if (err != SCSI_DH_OK)
goto clean_ctlr;
- if (!try_module_get(THIS_MODULE))
- goto clean_ctlr;
-
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
@@ -924,7 +921,6 @@ static void rdac_bus_detach( struct scsi_device *sdev )
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
kfree(scsi_dh_data);
- module_put(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
}
--
1.9.1
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index aa40fcb..471ffd1 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -363,7 +363,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
HP_SW_NAME);
- return 0;
+ return -ENOMEM;
}
h->dh_data.scsi_dh = &hp_sw_dh;
--
1.9.1
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 1a8dbf3..d8a8aac 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -108,19 +108,17 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
return 0;
}
- if (scsi_dh->attach) {
- if (!try_module_get(scsi_dh->module))
- return -EINVAL;
-
- err = scsi_dh->attach(sdev);
- if (err) {
- module_put(scsi_dh->module);
- return err;
- }
+ if (!try_module_get(scsi_dh->module))
+ return -EINVAL;
- kref_init(&sdev->scsi_dh_data->kref);
- sdev->scsi_dh_data->sdev = sdev;
+ err = scsi_dh->attach(sdev);
+ if (err) {
+ module_put(scsi_dh->module);
+ return err;
}
+
+ kref_init(&sdev->scsi_dh_data->kref);
+ sdev->scsi_dh_data->sdev = sdev;
return err;
}
@@ -154,7 +152,7 @@ static void scsi_dh_handler_detach(struct scsi_device *sdev,
if (!scsi_dh)
scsi_dh = sdev->scsi_dh_data->scsi_dh;
- if (scsi_dh && scsi_dh->detach)
+ if (scsi_dh)
kref_put(&sdev->scsi_dh_data->kref, __detach_handler);
}
@@ -343,6 +341,9 @@ int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
if (get_device_handler(scsi_dh->name))
return -EBUSY;
+ if (!scsi_dh->attach || !scsi_dh->detach)
+ return -EINVAL;
+
spin_lock(&list_lock);
list_add(&scsi_dh->list, &scsi_dh_list);
spin_unlock(&list_lock);
--
1.9.1
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 25 +++++++++----------------
drivers/scsi/device_handler/scsi_dh_emc.c | 24 ++++++++++--------------
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 23 +++++++++--------------
drivers/scsi/device_handler/scsi_dh_rdac.c | 25 +++++++++----------------
include/scsi/scsi_device.h | 1 -
5 files changed, 37 insertions(+), 61 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 45b1795..40a2b0e 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -62,6 +62,7 @@
#define ALUA_OPTIMIZE_STPG 1
struct alua_dh_data {
+ struct scsi_dh_data dh_data;
int group_id;
int rel_port;
int tpgs;
@@ -87,9 +88,7 @@ static int alua_check_sense(struct scsi_device *, struct scsi_sense_hdr *);
static inline struct alua_dh_data *get_alua_data(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- BUG_ON(scsi_dh_data == NULL);
- return ((struct alua_dh_data *) scsi_dh_data->buf);
+ return container_of(sdev->scsi_dh_data, struct alua_dh_data, dh_data);
}
static int realloc_buffer(struct alua_dh_data *h, unsigned len)
@@ -839,21 +838,18 @@ static struct scsi_device_handler alua_dh = {
*/
static int alua_bus_attach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
struct alua_dh_data *h;
unsigned long flags;
int err = SCSI_DH_OK;
- scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
- + sizeof(*h) , GFP_KERNEL);
- if (!scsi_dh_data) {
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
ALUA_DH_NAME);
return -ENOMEM;
}
- scsi_dh_data->scsi_dh = &alua_dh;
- h = (struct alua_dh_data *) scsi_dh_data->buf;
+ h->dh_data.scsi_dh = &alua_dh;
h->tpgs = TPGS_MODE_UNINITIALIZED;
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
@@ -867,14 +863,14 @@ static int alua_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = scsi_dh_data;
+ sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
return 0;
failed:
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n", ALUA_DH_NAME);
return -EINVAL;
}
@@ -885,19 +881,16 @@ failed:
*/
static void alua_bus_detach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
- struct alua_dh_data *h;
+ struct alua_dh_data *h = get_alua_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
- h = (struct alua_dh_data *) scsi_dh_data->buf;
if (h->buff && h->inq != h->buff)
kfree(h->buff);
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", ALUA_DH_NAME);
}
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 153b4c3..c2e26cd 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -72,6 +72,7 @@ static const char * lun_state[] =
};
struct clariion_dh_data {
+ struct scsi_dh_data dh_data;
/*
* Flags:
* CLARIION_SHORT_TRESPASS
@@ -116,9 +117,8 @@ struct clariion_dh_data {
static inline struct clariion_dh_data
*get_clariion_data(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- BUG_ON(scsi_dh_data == NULL);
- return ((struct clariion_dh_data *) scsi_dh_data->buf);
+ return container_of(sdev->scsi_dh_data, struct clariion_dh_data,
+ dh_data);
}
/*
@@ -665,21 +665,18 @@ static struct scsi_device_handler clariion_dh = {
static int clariion_bus_attach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
struct clariion_dh_data *h;
unsigned long flags;
int err;
- scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
- + sizeof(*h) , GFP_KERNEL);
- if (!scsi_dh_data) {
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
CLARIION_NAME);
return -ENOMEM;
}
- scsi_dh_data->scsi_dh = &clariion_dh;
- h = (struct clariion_dh_data *) scsi_dh_data->buf;
+ h->dh_data.scsi_dh = &clariion_dh;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
@@ -693,7 +690,7 @@ static int clariion_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = scsi_dh_data;
+ sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev,
@@ -705,7 +702,7 @@ static int clariion_bus_attach(struct scsi_device *sdev)
return 0;
failed:
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
CLARIION_NAME);
return -EINVAL;
@@ -713,18 +710,17 @@ failed:
static void clariion_bus_detach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
+ struct clariion_dh_data *h = get_clariion_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
CLARIION_NAME);
- kfree(scsi_dh_data);
+ kfree(h);
}
static int __init clariion_init(void)
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 367e6f5..040998c 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -38,6 +38,7 @@
#define HP_SW_PATH_PASSIVE 1
struct hp_sw_dh_data {
+ struct scsi_dh_data dh_data;
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
int path_state;
int retries;
@@ -51,9 +52,7 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *);
static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- BUG_ON(scsi_dh_data == NULL);
- return ((struct hp_sw_dh_data *) scsi_dh_data->buf);
+ return container_of(sdev->scsi_dh_data, struct hp_sw_dh_data, dh_data);
}
/*
@@ -354,21 +353,18 @@ static struct scsi_device_handler hp_sw_dh = {
static int hp_sw_bus_attach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
struct hp_sw_dh_data *h;
unsigned long flags;
int ret;
- scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
- + sizeof(*h) , GFP_KERNEL);
- if (!scsi_dh_data) {
+ h = kzalloc(sizeof(*h), GFP_KERNEL);
+ if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
HP_SW_NAME);
return 0;
}
- scsi_dh_data->scsi_dh = &hp_sw_dh;
- h = (struct hp_sw_dh_data *) scsi_dh_data->buf;
+ h->dh_data.scsi_dh = &hp_sw_dh;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
@@ -378,7 +374,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = scsi_dh_data;
+ sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
@@ -388,7 +384,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
return 0;
failed:
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
HP_SW_NAME);
return -EINVAL;
@@ -396,17 +392,16 @@ failed:
static void hp_sw_bus_detach( struct scsi_device *sdev )
{
- struct scsi_dh_data *scsi_dh_data;
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME);
- kfree(scsi_dh_data);
+ kfree(h);
}
static int __init hp_sw_init(void)
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index b850954..ef8caaa 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -181,6 +181,7 @@ struct c2_inquiry {
};
struct rdac_dh_data {
+ struct scsi_dh_data dh_data;
struct rdac_controller *ctlr;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
@@ -261,9 +262,7 @@ do { \
static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- BUG_ON(scsi_dh_data == NULL);
- return ((struct rdac_dh_data *) scsi_dh_data->buf);
+ return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data);
}
static struct request *get_rdac_req(struct scsi_device *sdev,
@@ -842,23 +841,20 @@ static struct scsi_device_handler rdac_dh = {
static int rdac_bus_attach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
struct rdac_dh_data *h;
unsigned long flags;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
- scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
- + sizeof(*h) , GFP_KERNEL);
- if (!scsi_dh_data) {
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
RDAC_NAME);
return -ENOMEM;
}
- scsi_dh_data->scsi_dh = &rdac_dh;
- h = (struct rdac_dh_data *) scsi_dh_data->buf;
+ h->dh_data.scsi_dh = &rdac_dh;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
@@ -879,7 +875,7 @@ static int rdac_bus_attach(struct scsi_device *sdev)
goto clean_ctlr;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = scsi_dh_data;
+ sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev,
@@ -895,7 +891,7 @@ clean_ctlr:
spin_unlock(&list_lock);
failed:
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
RDAC_NAME);
return -EINVAL;
@@ -903,12 +899,9 @@ failed:
static void rdac_bus_detach( struct scsi_device *sdev )
{
- struct scsi_dh_data *scsi_dh_data;
- struct rdac_dh_data *h;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
unsigned long flags;
- scsi_dh_data = sdev->scsi_dh_data;
- h = (struct rdac_dh_data *) scsi_dh_data->buf;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
@@ -920,7 +913,7 @@ static void rdac_bus_detach( struct scsi_device *sdev )
if (h->ctlr)
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
}
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 27ecee7..fb46864 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -228,7 +228,6 @@ struct scsi_dh_data {
struct scsi_device_handler *scsi_dh;
struct scsi_device *sdev;
struct kref kref;
- char buf[0];
};
#define to_scsi_device(d) \
--
1.9.1
All drivers now do their own matching, so there is no more need to expose
a device list as part of the interface.
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh_emc.c | 6 ++++--
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 6 ++++--
drivers/scsi/device_handler/scsi_dh_rdac.c | 6 ++++--
include/scsi/scsi_device.h | 6 ------
4 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index c2e26cd..800deb7 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -622,7 +622,10 @@ done:
return result;
}
-static const struct scsi_dh_devlist clariion_dev_list[] = {
+static const struct {
+ char *vendor;
+ char *model;
+} clariion_dev_list[] = {
{"DGC", "RAID"},
{"DGC", "DISK"},
{"DGC", "VRAID"},
@@ -653,7 +656,6 @@ static void clariion_bus_detach(struct scsi_device *sdev);
static struct scsi_device_handler clariion_dh = {
.name = CLARIION_NAME,
.module = THIS_MODULE,
- .devlist = clariion_dev_list,
.attach = clariion_bus_attach,
.detach = clariion_bus_detach,
.check_sense = clariion_check_sense,
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 040998c..aa40fcb 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -311,7 +311,10 @@ static int hp_sw_activate(struct scsi_device *sdev,
return 0;
}
-static const struct scsi_dh_devlist hp_sw_dh_data_list[] = {
+static const struct {
+ char *vendor;
+ char *model;
+} hp_sw_dh_data_list[] = {
{"COMPAQ", "MSA1000 VOLUME"},
{"COMPAQ", "HSV110"},
{"HP", "HSV100"},
@@ -343,7 +346,6 @@ static void hp_sw_bus_detach(struct scsi_device *sdev);
static struct scsi_device_handler hp_sw_dh = {
.name = HP_SW_NAME,
.module = THIS_MODULE,
- .devlist = hp_sw_dh_data_list,
.attach = hp_sw_bus_attach,
.detach = hp_sw_bus_detach,
.activate = hp_sw_activate,
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index ef8caaa..8b09528 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -778,7 +778,10 @@ static int rdac_check_sense(struct scsi_device *sdev,
return SCSI_RETURN_NOT_HANDLED;
}
-static const struct scsi_dh_devlist rdac_dev_list[] = {
+static const struct {
+ char *vendor;
+ char *model;
+} rdac_dev_list[] = {
{"IBM", "1722"},
{"IBM", "1724"},
{"IBM", "1726"},
@@ -830,7 +833,6 @@ static void rdac_bus_detach(struct scsi_device *sdev);
static struct scsi_device_handler rdac_dh = {
.name = RDAC_NAME,
.module = THIS_MODULE,
- .devlist = rdac_dev_list,
.prep_fn = rdac_prep_fn,
.check_sense = rdac_check_sense,
.attach = rdac_bus_attach,
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index fb46864..ba6c9b7 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -201,11 +201,6 @@ struct scsi_device {
unsigned long sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));
-struct scsi_dh_devlist {
- char *vendor;
- char *model;
-};
-
typedef void (*activate_complete)(void *, int);
struct scsi_device_handler {
/* Used by the infrastructure */
@@ -214,7 +209,6 @@ struct scsi_device_handler {
/* Filled by the hardware handler */
struct module *module;
const char *name;
- const struct scsi_dh_devlist *devlist;
int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
int (*attach)(struct scsi_device *);
void (*detach)(struct scsi_device *);
--
1.9.1
Move all code to set up and tear down sdev->scsi_dh_data to common code.
Signed-off-by: Christoph Hellwig <[email protected]>
---
drivers/scsi/device_handler/scsi_dh.c | 29 ++++++++++----
drivers/scsi/device_handler/scsi_dh_alua.c | 59 ++++++++++-------------------
drivers/scsi/device_handler/scsi_dh_emc.c | 58 +++++++++-------------------
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 54 ++++++++------------------
drivers/scsi/device_handler/scsi_dh_rdac.c | 52 +++++++------------------
include/scsi/scsi_device.h | 2 +-
6 files changed, 87 insertions(+), 167 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index d8a8aac..1dba62c 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -98,7 +98,7 @@ device_handler_match(struct scsi_device_handler *scsi_dh,
static int scsi_dh_handler_attach(struct scsi_device *sdev,
struct scsi_device_handler *scsi_dh)
{
- int err = 0;
+ struct scsi_dh_data *d;
if (sdev->scsi_dh_data) {
if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
@@ -111,15 +111,22 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
if (!try_module_get(scsi_dh->module))
return -EINVAL;
- err = scsi_dh->attach(sdev);
- if (err) {
+ d = scsi_dh->attach(sdev);
+ if (IS_ERR(d)) {
+ sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%ld)\n",
+ scsi_dh->name, PTR_ERR(d));
module_put(scsi_dh->module);
- return err;
+ return PTR_ERR(d);
}
- kref_init(&sdev->scsi_dh_data->kref);
- sdev->scsi_dh_data->sdev = sdev;
- return err;
+ d->scsi_dh = scsi_dh;
+ kref_init(&d->kref);
+ d->sdev = sdev;
+
+ spin_lock_irq(sdev->request_queue->queue_lock);
+ sdev->scsi_dh_data = d;
+ spin_unlock_irq(sdev->request_queue->queue_lock);
+ return 0;
}
static void __detach_handler (struct kref *kref)
@@ -127,8 +134,14 @@ static void __detach_handler (struct kref *kref)
struct scsi_dh_data *scsi_dh_data =
container_of(kref, struct scsi_dh_data, kref);
struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
+ struct scsi_device *sdev = scsi_dh_data->sdev;
+
+ spin_lock_irq(sdev->request_queue->queue_lock);
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irq(sdev->request_queue->queue_lock);
- scsi_dh->detach(scsi_dh_data->sdev);
+ scsi_dh->detach(sdev);
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", scsi_dh->name);
module_put(scsi_dh->module);
}
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 40a2b0e..94d1c36 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -817,39 +817,18 @@ static bool alua_match(struct scsi_device *sdev)
return (scsi_device_tpgs(sdev) != 0);
}
-static int alua_bus_attach(struct scsi_device *sdev);
-static void alua_bus_detach(struct scsi_device *sdev);
-
-static struct scsi_device_handler alua_dh = {
- .name = ALUA_DH_NAME,
- .module = THIS_MODULE,
- .attach = alua_bus_attach,
- .detach = alua_bus_detach,
- .prep_fn = alua_prep_fn,
- .check_sense = alua_check_sense,
- .activate = alua_activate,
- .set_params = alua_set_params,
- .match = alua_match,
-};
-
/*
* alua_bus_attach - Attach device handler
* @sdev: device to be attached to
*/
-static int alua_bus_attach(struct scsi_device *sdev)
+static struct scsi_dh_data *alua_bus_attach(struct scsi_device *sdev)
{
struct alua_dh_data *h;
- unsigned long flags;
- int err = SCSI_DH_OK;
+ int err;
h = kzalloc(sizeof(*h) , GFP_KERNEL);
- if (!h) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
- ALUA_DH_NAME);
- return -ENOMEM;
- }
-
- h->dh_data.scsi_dh = &alua_dh;
+ if (!h)
+ return ERR_PTR(-ENOMEM);
h->tpgs = TPGS_MODE_UNINITIALIZED;
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
@@ -859,20 +838,14 @@ static int alua_bus_attach(struct scsi_device *sdev)
h->sdev = sdev;
err = alua_initialize(sdev, h);
- if ((err != SCSI_DH_OK) && (err != SCSI_DH_DEV_OFFLINED))
+ if (err != SCSI_DH_OK && err != SCSI_DH_DEV_OFFLINED)
goto failed;
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = &h->dh_data;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
-
- return 0;
-
+ return &h->dh_data;
failed:
kfree(h);
- sdev_printk(KERN_ERR, sdev, "%s: not attached\n", ALUA_DH_NAME);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
/*
@@ -882,18 +855,24 @@ failed:
static void alua_bus_detach(struct scsi_device *sdev)
{
struct alua_dh_data *h = get_alua_data(sdev);
- unsigned long flags;
-
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
if (h->buff && h->inq != h->buff)
kfree(h->buff);
kfree(h);
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", ALUA_DH_NAME);
}
+static struct scsi_device_handler alua_dh = {
+ .name = ALUA_DH_NAME,
+ .module = THIS_MODULE,
+ .attach = alua_bus_attach,
+ .detach = alua_bus_detach,
+ .prep_fn = alua_prep_fn,
+ .check_sense = alua_check_sense,
+ .activate = alua_activate,
+ .set_params = alua_set_params,
+ .match = alua_match,
+};
+
static int __init alua_init(void)
{
int r;
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 800deb7..6ed1caa 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -650,35 +650,14 @@ static bool clariion_match(struct scsi_device *sdev)
return false;
}
-static int clariion_bus_attach(struct scsi_device *sdev);
-static void clariion_bus_detach(struct scsi_device *sdev);
-
-static struct scsi_device_handler clariion_dh = {
- .name = CLARIION_NAME,
- .module = THIS_MODULE,
- .attach = clariion_bus_attach,
- .detach = clariion_bus_detach,
- .check_sense = clariion_check_sense,
- .activate = clariion_activate,
- .prep_fn = clariion_prep_fn,
- .set_params = clariion_set_params,
- .match = clariion_match,
-};
-
-static int clariion_bus_attach(struct scsi_device *sdev)
+static struct scsi_dh_data *clariion_bus_attach(struct scsi_device *sdev)
{
struct clariion_dh_data *h;
- unsigned long flags;
int err;
h = kzalloc(sizeof(*h) , GFP_KERNEL);
- if (!h) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
- CLARIION_NAME);
- return -ENOMEM;
- }
-
- h->dh_data.scsi_dh = &clariion_dh;
+ if (!h)
+ return ERR_PTR(-ENOMEM);
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
@@ -691,40 +670,37 @@ static int clariion_bus_attach(struct scsi_device *sdev)
if (err != SCSI_DH_OK)
goto failed;
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = &h->dh_data;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
sdev_printk(KERN_INFO, sdev,
"%s: connected to SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, h->current_sp + 'A',
h->port, lun_state[h->lun_state],
h->default_sp + 'A');
-
- return 0;
+ return &h->dh_data;
failed:
kfree(h);
- sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
- CLARIION_NAME);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
static void clariion_bus_detach(struct scsi_device *sdev)
{
struct clariion_dh_data *h = get_clariion_data(sdev);
- unsigned long flags;
-
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
- CLARIION_NAME);
kfree(h);
}
+static struct scsi_device_handler clariion_dh = {
+ .name = CLARIION_NAME,
+ .module = THIS_MODULE,
+ .attach = clariion_bus_attach,
+ .detach = clariion_bus_detach,
+ .check_sense = clariion_check_sense,
+ .activate = clariion_activate,
+ .prep_fn = clariion_prep_fn,
+ .set_params = clariion_set_params,
+ .match = clariion_match,
+};
+
static int __init clariion_init(void)
{
int r;
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 471ffd1..485d995 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -340,33 +340,14 @@ static bool hp_sw_match(struct scsi_device *sdev)
return false;
}
-static int hp_sw_bus_attach(struct scsi_device *sdev);
-static void hp_sw_bus_detach(struct scsi_device *sdev);
-
-static struct scsi_device_handler hp_sw_dh = {
- .name = HP_SW_NAME,
- .module = THIS_MODULE,
- .attach = hp_sw_bus_attach,
- .detach = hp_sw_bus_detach,
- .activate = hp_sw_activate,
- .prep_fn = hp_sw_prep_fn,
- .match = hp_sw_match,
-};
-
-static int hp_sw_bus_attach(struct scsi_device *sdev)
+static struct scsi_dh_data *hp_sw_bus_attach(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h;
- unsigned long flags;
int ret;
h = kzalloc(sizeof(*h), GFP_KERNEL);
- if (!h) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
- HP_SW_NAME);
- return -ENOMEM;
- }
-
- h->dh_data.scsi_dh = &hp_sw_dh;
+ if (!h)
+ return ERR_PTR(-ENOMEM);
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
@@ -375,37 +356,32 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED)
goto failed;
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = &h->dh_data;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
"active":"passive");
-
- return 0;
-
+ return &h->dh_data;
failed:
kfree(h);
- sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
- HP_SW_NAME);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
static void hp_sw_bus_detach( struct scsi_device *sdev )
{
struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
- unsigned long flags;
-
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME);
kfree(h);
}
+static struct scsi_device_handler hp_sw_dh = {
+ .name = HP_SW_NAME,
+ .module = THIS_MODULE,
+ .attach = hp_sw_bus_attach,
+ .detach = hp_sw_bus_detach,
+ .activate = hp_sw_activate,
+ .prep_fn = hp_sw_prep_fn,
+ .match = hp_sw_match,
+};
+
static int __init hp_sw_init(void)
{
return scsi_register_device_handler(&hp_sw_dh);
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 8b09528..363872a 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -827,36 +827,16 @@ static bool rdac_match(struct scsi_device *sdev)
return false;
}
-static int rdac_bus_attach(struct scsi_device *sdev);
-static void rdac_bus_detach(struct scsi_device *sdev);
-
-static struct scsi_device_handler rdac_dh = {
- .name = RDAC_NAME,
- .module = THIS_MODULE,
- .prep_fn = rdac_prep_fn,
- .check_sense = rdac_check_sense,
- .attach = rdac_bus_attach,
- .detach = rdac_bus_detach,
- .activate = rdac_activate,
- .match = rdac_match,
-};
-
-static int rdac_bus_attach(struct scsi_device *sdev)
+static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)
{
struct rdac_dh_data *h;
- unsigned long flags;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
h = kzalloc(sizeof(*h) , GFP_KERNEL);
- if (!h) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
- RDAC_NAME);
- return -ENOMEM;
- }
-
- h->dh_data.scsi_dh = &rdac_dh;
+ if (!h)
+ return ERR_PTR(-ENOMEM);
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
@@ -876,15 +856,10 @@ static int rdac_bus_attach(struct scsi_device *sdev)
if (err != SCSI_DH_OK)
goto clean_ctlr;
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = &h->dh_data;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
sdev_printk(KERN_NOTICE, sdev,
"%s: LUN %d (%s) (%s)\n",
RDAC_NAME, h->lun, mode[(int)h->mode],
lun_state[(int)h->lun_state]);
-
return 0;
clean_ctlr:
@@ -894,32 +869,33 @@ clean_ctlr:
failed:
kfree(h);
- sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
- RDAC_NAME);
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
}
static void rdac_bus_detach( struct scsi_device *sdev )
{
struct rdac_dh_data *h = get_rdac_data(sdev);
- unsigned long flags;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
- spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
-
spin_lock(&list_lock);
if (h->ctlr)
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
kfree(h);
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
}
-
+static struct scsi_device_handler rdac_dh = {
+ .name = RDAC_NAME,
+ .module = THIS_MODULE,
+ .prep_fn = rdac_prep_fn,
+ .check_sense = rdac_check_sense,
+ .attach = rdac_bus_attach,
+ .detach = rdac_bus_detach,
+ .activate = rdac_activate,
+ .match = rdac_match,
+};
static int __init rdac_init(void)
{
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index ba6c9b7..3f7e7be 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -210,7 +210,7 @@ struct scsi_device_handler {
struct module *module;
const char *name;
int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
- int (*attach)(struct scsi_device *);
+ struct scsi_dh_data *(*attach)(struct scsi_device *);
void (*detach)(struct scsi_device *);
int (*activate)(struct scsi_device *, activate_complete, void *);
int (*prep_fn)(struct scsi_device *, struct request *);
--
1.9.1
On 10/19/2014 05:59 PM, Christoph Hellwig wrote:
> We need to grab a reference to the module before calling the attach
> routines to avoid a small race vs module removal. It also cleans up
> the code significantly as a side effect.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> drivers/scsi/device_handler/scsi_dh.c | 31 ++++++++++++++++++++---------
> drivers/scsi/device_handler/scsi_dh_alua.c | 4 ----
> drivers/scsi/device_handler/scsi_dh_emc.c | 4 ----
> drivers/scsi/device_handler/scsi_dh_hp_sw.c | 4 ----
> drivers/scsi/device_handler/scsi_dh_rdac.c | 4 ----
> 5 files changed, 22 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
> index 33e422e..1a8dbf3 100644
> --- a/drivers/scsi/device_handler/scsi_dh.c
> +++ b/drivers/scsi/device_handler/scsi_dh.c
> @@ -102,23 +102,36 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
>
> if (sdev->scsi_dh_data) {
> if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
> - err = -EBUSY;
> - else
> - kref_get(&sdev->scsi_dh_data->kref);
> - } else if (scsi_dh->attach) {
> + return -EBUSY;
> +
> + kref_get(&sdev->scsi_dh_data->kref);
> + return 0;
> + }
> +
> + if (scsi_dh->attach) {
> + if (!try_module_get(scsi_dh->module))
> + return -EINVAL;
> +
> err = scsi_dh->attach(sdev);
> - if (!err) {
> - kref_init(&sdev->scsi_dh_data->kref);
> - sdev->scsi_dh_data->sdev = sdev;
> + if (err) {
> + module_put(scsi_dh->module);
> + return err;
> }
> +
> + kref_init(&sdev->scsi_dh_data->kref);
> + sdev->scsi_dh_data->sdev = sdev;
> }
> return err;
> }
>
> static void __detach_handler (struct kref *kref)
> {
> - struct scsi_dh_data *scsi_dh_data = container_of(kref, struct scsi_dh_data, kref);
> - scsi_dh_data->scsi_dh->detach(scsi_dh_data->sdev);
> + struct scsi_dh_data *scsi_dh_data =
> + container_of(kref, struct scsi_dh_data, kref);
> + struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
> +
> + scsi_dh->detach(scsi_dh_data->sdev);
> + module_put(scsi_dh->module);
> }
>
> /*
Is it guaranteed that you cannot call ->attach() for devices which
already have a device_handler attached?
You've skipped the case
scsi_dh != sdev->scsi_dh_data->scsi_dh
IE someone called 'attach()' on a device which already has a
different device_handler attached to it.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> All drivers now do their own matching, so there is no more need to expose
> a device list as part of the interface.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> drivers/scsi/device_handler/scsi_dh_emc.c | 6 ++++--
> drivers/scsi/device_handler/scsi_dh_hp_sw.c | 6 ++++--
> drivers/scsi/device_handler/scsi_dh_rdac.c | 6 ++++--
> include/scsi/scsi_device.h | 6 ------
> 4 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
> index c2e26cd..800deb7 100644
> --- a/drivers/scsi/device_handler/scsi_dh_emc.c
> +++ b/drivers/scsi/device_handler/scsi_dh_emc.c
> @@ -622,7 +622,10 @@ done:
> return result;
> }
>
> -static const struct scsi_dh_devlist clariion_dev_list[] = {
> +static const struct {
> + char *vendor;
> + char *model;
> +} clariion_dev_list[] = {
> {"DGC", "RAID"},
> {"DGC", "DISK"},
> {"DGC", "VRAID"},
> @@ -653,7 +656,6 @@ static void clariion_bus_detach(struct scsi_device *sdev);
> static struct scsi_device_handler clariion_dh = {
> .name = CLARIION_NAME,
> .module = THIS_MODULE,
> - .devlist = clariion_dev_list,
> .attach = clariion_bus_attach,
> .detach = clariion_bus_detach,
> .check_sense = clariion_check_sense,
> diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> index 040998c..aa40fcb 100644
> --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> @@ -311,7 +311,10 @@ static int hp_sw_activate(struct scsi_device *sdev,
> return 0;
> }
>
> -static const struct scsi_dh_devlist hp_sw_dh_data_list[] = {
> +static const struct {
> + char *vendor;
> + char *model;
> +} hp_sw_dh_data_list[] = {
> {"COMPAQ", "MSA1000 VOLUME"},
> {"COMPAQ", "HSV110"},
> {"HP", "HSV100"},
> @@ -343,7 +346,6 @@ static void hp_sw_bus_detach(struct scsi_device *sdev);
> static struct scsi_device_handler hp_sw_dh = {
> .name = HP_SW_NAME,
> .module = THIS_MODULE,
> - .devlist = hp_sw_dh_data_list,
> .attach = hp_sw_bus_attach,
> .detach = hp_sw_bus_detach,
> .activate = hp_sw_activate,
> diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
> index ef8caaa..8b09528 100644
> --- a/drivers/scsi/device_handler/scsi_dh_rdac.c
> +++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
> @@ -778,7 +778,10 @@ static int rdac_check_sense(struct scsi_device *sdev,
> return SCSI_RETURN_NOT_HANDLED;
> }
>
> -static const struct scsi_dh_devlist rdac_dev_list[] = {
> +static const struct {
> + char *vendor;
> + char *model;
> +} rdac_dev_list[] = {
> {"IBM", "1722"},
> {"IBM", "1724"},
> {"IBM", "1726"},
> @@ -830,7 +833,6 @@ static void rdac_bus_detach(struct scsi_device *sdev);
> static struct scsi_device_handler rdac_dh = {
> .name = RDAC_NAME,
> .module = THIS_MODULE,
> - .devlist = rdac_dev_list,
> .prep_fn = rdac_prep_fn,
> .check_sense = rdac_check_sense,
> .attach = rdac_bus_attach,
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index fb46864..ba6c9b7 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -201,11 +201,6 @@ struct scsi_device {
> unsigned long sdev_data[0];
> } __attribute__((aligned(sizeof(unsigned long))));
>
> -struct scsi_dh_devlist {
> - char *vendor;
> - char *model;
> -};
> -
> typedef void (*activate_complete)(void *, int);
> struct scsi_device_handler {
> /* Used by the infrastructure */
> @@ -214,7 +209,6 @@ struct scsi_device_handler {
> /* Filled by the hardware handler */
> struct module *module;
> const char *name;
> - const struct scsi_dh_devlist *devlist;
> int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
> int (*attach)(struct scsi_device *);
> void (*detach)(struct scsi_device *);
>
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> drivers/scsi/device_handler/scsi_dh.c | 25 +++++++++++++------------
> 1 file changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
> index 1a8dbf3..d8a8aac 100644
> --- a/drivers/scsi/device_handler/scsi_dh.c
> +++ b/drivers/scsi/device_handler/scsi_dh.c
> @@ -108,19 +108,17 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
> return 0;
> }
>
> - if (scsi_dh->attach) {
> - if (!try_module_get(scsi_dh->module))
> - return -EINVAL;
> -
> - err = scsi_dh->attach(sdev);
> - if (err) {
> - module_put(scsi_dh->module);
> - return err;
> - }
> + if (!try_module_get(scsi_dh->module))
> + return -EINVAL;
>
> - kref_init(&sdev->scsi_dh_data->kref);
> - sdev->scsi_dh_data->sdev = sdev;
> + err = scsi_dh->attach(sdev);
> + if (err) {
> + module_put(scsi_dh->module);
> + return err;
> }
> +
> + kref_init(&sdev->scsi_dh_data->kref);
> + sdev->scsi_dh_data->sdev = sdev;
> return err;
> }
>
> @@ -154,7 +152,7 @@ static void scsi_dh_handler_detach(struct scsi_device *sdev,
> if (!scsi_dh)
> scsi_dh = sdev->scsi_dh_data->scsi_dh;
>
> - if (scsi_dh && scsi_dh->detach)
> + if (scsi_dh)
> kref_put(&sdev->scsi_dh_data->kref, __detach_handler);
> }
>
> @@ -343,6 +341,9 @@ int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
> if (get_device_handler(scsi_dh->name))
> return -EBUSY;
>
> + if (!scsi_dh->attach || !scsi_dh->detach)
> + return -EINVAL;
> +
> spin_lock(&list_lock);
> list_add(&scsi_dh->list, &scsi_dh_list);
> spin_unlock(&list_lock);
>
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> drivers/scsi/device_handler/scsi_dh_hp_sw.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> index aa40fcb..471ffd1 100644
> --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> @@ -363,7 +363,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
> if (!h) {
> sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
> HP_SW_NAME);
> - return 0;
> + return -ENOMEM;
> }
>
> h->dh_data.scsi_dh = &hp_sw_dh;
>
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> Move all code to set up and tear down sdev->scsi_dh_data to common code.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On Mon, Oct 20, 2014 at 08:01:20AM +0200, Hannes Reinecke wrote:
> Is it guaranteed that you cannot call ->attach() for devices which
> already have a device_handler attached?
> You've skipped the case
>
> scsi_dh != sdev->scsi_dh_data->scsi_dh
No. Just instead of an if / else it's an if with an early return in the
new code.
On 10/20/2014 08:53 AM, Christoph Hellwig wrote:
> On Mon, Oct 20, 2014 at 08:01:20AM +0200, Hannes Reinecke wrote:
>> Is it guaranteed that you cannot call ->attach() for devices which
>> already have a device_handler attached?
>> You've skipped the case
>>
>> scsi_dh != sdev->scsi_dh_data->scsi_dh
>
> No. Just instead of an if / else it's an if with an early return in the
> new code.
>
right. Indeed.
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
On 10/19/2014 11:00 AM, Christoph Hellwig wrote:
> -static int rdac_bus_attach(struct scsi_device *sdev)
> +static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)
> {
> struct rdac_dh_data *h;
> - unsigned long flags;
> int err;
> char array_name[ARRAY_LABEL_LEN];
> char array_id[UNIQUE_ID_LEN];
>
> h = kzalloc(sizeof(*h) , GFP_KERNEL);
> - if (!h) {
> - sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
> - RDAC_NAME);
> - return -ENOMEM;
> - }
> -
> - h->dh_data.scsi_dh = &rdac_dh;
> + if (!h)
> + return ERR_PTR(-ENOMEM);
> h->lun = UNINITIALIZED_LUN;
> h->state = RDAC_STATE_ACTIVE;
>
> @@ -876,15 +856,10 @@ static int rdac_bus_attach(struct scsi_device *sdev)
> if (err != SCSI_DH_OK)
> goto clean_ctlr;
>
> - spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> - sdev->scsi_dh_data = &h->dh_data;
> - spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> -
> sdev_printk(KERN_NOTICE, sdev,
> "%s: LUN %d (%s) (%s)\n",
> RDAC_NAME, h->lun, mode[(int)h->mode],
> lun_state[(int)h->lun_state]);
> -
> return 0;
Was this supposed to return a "struct scsi_dh_data *" instead of zero here?
On Tue, Oct 28, 2014 at 12:53:00PM -0500, Mike Christie wrote:
> Was this supposed to return a "struct scsi_dh_data *" instead of zero here?
Yes, thanks for catching it.