From: Arnd Bergmann <[email protected]>
Calling a function through an incompatible pointer type causes breaks
kcfi, so clang warns about the assignments:
drivers/scsi/cxlflash/main.c:3498:3: error: cast from 'int (*)(struct cxlflash_cfg *, struct ht_cxlflash_lun_provision *)' to 'hioctl' (aka 'int (*)(struct cxlflash_cfg *, void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
3498 | (hioctl)cxlflash_lun_provision },
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:3500:3: error: cast from 'int (*)(struct cxlflash_cfg *, struct ht_cxlflash_afu_debug *)' to 'hioctl' (aka 'int (*)(struct cxlflash_cfg *, void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
3500 | (hioctl)cxlflash_afu_debug },
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
Address these by changing the functions to have the correct type
and replace the function pointer cast with a cast of its argument.
Link: https://lore.kernel.org/lkml/[email protected]/
Signed-off-by: Arnd Bergmann <[email protected]>
---
v2: update kerneldoc documentation
---
drivers/scsi/cxlflash/lunmgt.c | 6 ++---
drivers/scsi/cxlflash/main.c | 18 +++++++-------
drivers/scsi/cxlflash/superpipe.c | 40 +++++++++++++++----------------
drivers/scsi/cxlflash/superpipe.h | 11 ++++-----
drivers/scsi/cxlflash/vlun.c | 9 ++++---
5 files changed, 38 insertions(+), 46 deletions(-)
diff --git a/drivers/scsi/cxlflash/lunmgt.c b/drivers/scsi/cxlflash/lunmgt.c
index e0e15b44a2e6..52405c6462f8 100644
--- a/drivers/scsi/cxlflash/lunmgt.c
+++ b/drivers/scsi/cxlflash/lunmgt.c
@@ -216,7 +216,7 @@ void cxlflash_term_global_luns(void)
/**
* cxlflash_manage_lun() - handles LUN management activities
* @sdev: SCSI device associated with LUN.
- * @manage: Manage ioctl data structure.
+ * @arg: Manage ioctl data structure.
*
* This routine is used to notify the driver about a LUN's WWID and associate
* SCSI devices (sdev) with a global LUN instance. Additionally it serves to
@@ -224,9 +224,9 @@ void cxlflash_term_global_luns(void)
*
* Return: 0 on success, -errno on failure
*/
-int cxlflash_manage_lun(struct scsi_device *sdev,
- struct dk_cxlflash_manage_lun *manage)
+int cxlflash_manage_lun(struct scsi_device *sdev, void *arg)
{
+ struct dk_cxlflash_manage_lun *manage = arg;
struct cxlflash_cfg *cfg = shost_priv(sdev->host);
struct device *dev = &cfg->dev->dev;
struct llun_info *lli = NULL;
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index e8382cc5cf23..e4b45b7e3277 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -3280,13 +3280,13 @@ static char *decode_hioctl(unsigned int cmd)
/**
* cxlflash_lun_provision() - host LUN provisioning handler
* @cfg: Internal structure associated with the host.
- * @lunprov: Kernel copy of userspace ioctl data structure.
+ * @arg: Kernel copy of userspace ioctl data structure.
*
* Return: 0 on success, -errno on failure
*/
-static int cxlflash_lun_provision(struct cxlflash_cfg *cfg,
- struct ht_cxlflash_lun_provision *lunprov)
+static int cxlflash_lun_provision(struct cxlflash_cfg *cfg, void *arg)
{
+ struct ht_cxlflash_lun_provision *lunprov = arg;
struct afu *afu = cfg->afu;
struct device *dev = &cfg->dev->dev;
struct sisl_ioarcb rcb;
@@ -3371,16 +3371,16 @@ static int cxlflash_lun_provision(struct cxlflash_cfg *cfg,
/**
* cxlflash_afu_debug() - host AFU debug handler
* @cfg: Internal structure associated with the host.
- * @afu_dbg: Kernel copy of userspace ioctl data structure.
+ * @arg: Kernel copy of userspace ioctl data structure.
*
* For debug requests requiring a data buffer, always provide an aligned
* (cache line) buffer to the AFU to appease any alignment requirements.
*
* Return: 0 on success, -errno on failure
*/
-static int cxlflash_afu_debug(struct cxlflash_cfg *cfg,
- struct ht_cxlflash_afu_debug *afu_dbg)
+static int cxlflash_afu_debug(struct cxlflash_cfg *cfg, void *arg)
{
+ struct ht_cxlflash_afu_debug *afu_dbg = arg;
struct afu *afu = cfg->afu;
struct device *dev = &cfg->dev->dev;
struct sisl_ioarcb rcb;
@@ -3494,10 +3494,8 @@ static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd,
size_t size;
hioctl ioctl;
} ioctl_tbl[] = { /* NOTE: order matters here */
- { sizeof(struct ht_cxlflash_lun_provision),
- (hioctl)cxlflash_lun_provision },
- { sizeof(struct ht_cxlflash_afu_debug),
- (hioctl)cxlflash_afu_debug },
+ { sizeof(struct ht_cxlflash_lun_provision), cxlflash_lun_provision },
+ { sizeof(struct ht_cxlflash_afu_debug), cxlflash_afu_debug },
};
/* Hold read semaphore so we can drain if needed */
diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c
index e1b55b03e812..2d356fe2457a 100644
--- a/drivers/scsi/cxlflash/superpipe.c
+++ b/drivers/scsi/cxlflash/superpipe.c
@@ -729,8 +729,7 @@ int _cxlflash_disk_release(struct scsi_device *sdev,
return rc;
}
-int cxlflash_disk_release(struct scsi_device *sdev,
- struct dk_cxlflash_release *release)
+int cxlflash_disk_release(struct scsi_device *sdev, void *release)
{
return _cxlflash_disk_release(sdev, NULL, release);
}
@@ -955,8 +954,7 @@ static int _cxlflash_disk_detach(struct scsi_device *sdev,
return rc;
}
-static int cxlflash_disk_detach(struct scsi_device *sdev,
- struct dk_cxlflash_detach *detach)
+static int cxlflash_disk_detach(struct scsi_device *sdev, void *detach)
{
return _cxlflash_disk_detach(sdev, NULL, detach);
}
@@ -1305,7 +1303,7 @@ int check_state(struct cxlflash_cfg *cfg)
/**
* cxlflash_disk_attach() - attach a LUN to a context
* @sdev: SCSI device associated with LUN.
- * @attach: Attach ioctl data structure.
+ * @arg: Attach ioctl data structure.
*
* Creates a context and attaches LUN to it. A LUN can only be attached
* one time to a context (subsequent attaches for the same context/LUN pair
@@ -1314,9 +1312,9 @@ int check_state(struct cxlflash_cfg *cfg)
*
* Return: 0 on success, -errno on failure
*/
-static int cxlflash_disk_attach(struct scsi_device *sdev,
- struct dk_cxlflash_attach *attach)
+static int cxlflash_disk_attach(struct scsi_device *sdev, void *arg)
{
+ struct dk_cxlflash_attach *attach = arg;
struct cxlflash_cfg *cfg = shost_priv(sdev->host);
struct device *dev = &cfg->dev->dev;
struct afu *afu = cfg->afu;
@@ -1621,7 +1619,7 @@ static int recover_context(struct cxlflash_cfg *cfg,
/**
* cxlflash_afu_recover() - initiates AFU recovery
* @sdev: SCSI device associated with LUN.
- * @recover: Recover ioctl data structure.
+ * @arg: Recover ioctl data structure.
*
* Only a single recovery is allowed at a time to avoid exhausting CXL
* resources (leading to recovery failure) in the event that we're up
@@ -1648,9 +1646,9 @@ static int recover_context(struct cxlflash_cfg *cfg,
*
* Return: 0 on success, -errno on failure
*/
-static int cxlflash_afu_recover(struct scsi_device *sdev,
- struct dk_cxlflash_recover_afu *recover)
+static int cxlflash_afu_recover(struct scsi_device *sdev, void *arg)
{
+ struct dk_cxlflash_recover_afu *recover = arg;
struct cxlflash_cfg *cfg = shost_priv(sdev->host);
struct device *dev = &cfg->dev->dev;
struct llun_info *lli = sdev->hostdata;
@@ -1829,13 +1827,13 @@ static int process_sense(struct scsi_device *sdev,
/**
* cxlflash_disk_verify() - verifies a LUN is the same and handle size changes
* @sdev: SCSI device associated with LUN.
- * @verify: Verify ioctl data structure.
+ * @arg: Verify ioctl data structure.
*
* Return: 0 on success, -errno on failure
*/
-static int cxlflash_disk_verify(struct scsi_device *sdev,
- struct dk_cxlflash_verify *verify)
+static int cxlflash_disk_verify(struct scsi_device *sdev, void *arg)
{
+ struct dk_cxlflash_verify *verify = arg;
int rc = 0;
struct ctx_info *ctxi = NULL;
struct cxlflash_cfg *cfg = shost_priv(sdev->host);
@@ -2111,16 +2109,16 @@ int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
size_t size;
sioctl ioctl;
} ioctl_tbl[] = { /* NOTE: order matters here */
- {sizeof(struct dk_cxlflash_attach), (sioctl)cxlflash_disk_attach},
+ {sizeof(struct dk_cxlflash_attach), cxlflash_disk_attach},
{sizeof(struct dk_cxlflash_udirect), cxlflash_disk_direct_open},
- {sizeof(struct dk_cxlflash_release), (sioctl)cxlflash_disk_release},
- {sizeof(struct dk_cxlflash_detach), (sioctl)cxlflash_disk_detach},
- {sizeof(struct dk_cxlflash_verify), (sioctl)cxlflash_disk_verify},
- {sizeof(struct dk_cxlflash_recover_afu), (sioctl)cxlflash_afu_recover},
- {sizeof(struct dk_cxlflash_manage_lun), (sioctl)cxlflash_manage_lun},
+ {sizeof(struct dk_cxlflash_release), cxlflash_disk_release},
+ {sizeof(struct dk_cxlflash_detach), cxlflash_disk_detach},
+ {sizeof(struct dk_cxlflash_verify), cxlflash_disk_verify},
+ {sizeof(struct dk_cxlflash_recover_afu), cxlflash_afu_recover},
+ {sizeof(struct dk_cxlflash_manage_lun), cxlflash_manage_lun},
{sizeof(struct dk_cxlflash_uvirtual), cxlflash_disk_virtual_open},
- {sizeof(struct dk_cxlflash_resize), (sioctl)cxlflash_vlun_resize},
- {sizeof(struct dk_cxlflash_clone), (sioctl)cxlflash_disk_clone},
+ {sizeof(struct dk_cxlflash_resize), cxlflash_vlun_resize},
+ {sizeof(struct dk_cxlflash_clone), cxlflash_disk_clone},
};
/* Hold read semaphore so we can drain if needed */
diff --git a/drivers/scsi/cxlflash/superpipe.h b/drivers/scsi/cxlflash/superpipe.h
index 0e3b45964066..fe8c975d13d7 100644
--- a/drivers/scsi/cxlflash/superpipe.h
+++ b/drivers/scsi/cxlflash/superpipe.h
@@ -114,18 +114,16 @@ struct cxlflash_global {
struct page *err_page; /* One page of all 0xF for error notification */
};
-int cxlflash_vlun_resize(struct scsi_device *sdev,
- struct dk_cxlflash_resize *resize);
+int cxlflash_vlun_resize(struct scsi_device *sdev, void *resize);
int _cxlflash_vlun_resize(struct scsi_device *sdev, struct ctx_info *ctxi,
struct dk_cxlflash_resize *resize);
int cxlflash_disk_release(struct scsi_device *sdev,
- struct dk_cxlflash_release *release);
+ void *release);
int _cxlflash_disk_release(struct scsi_device *sdev, struct ctx_info *ctxi,
struct dk_cxlflash_release *release);
-int cxlflash_disk_clone(struct scsi_device *sdev,
- struct dk_cxlflash_clone *clone);
+int cxlflash_disk_clone(struct scsi_device *sdev, void *arg);
int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg);
@@ -145,8 +143,7 @@ void rhte_checkin(struct ctx_info *ctxi, struct sisl_rht_entry *rhte);
void cxlflash_ba_terminate(struct ba_lun *ba_lun);
-int cxlflash_manage_lun(struct scsi_device *sdev,
- struct dk_cxlflash_manage_lun *manage);
+int cxlflash_manage_lun(struct scsi_device *sdev, void *manage);
int check_state(struct cxlflash_cfg *cfg);
diff --git a/drivers/scsi/cxlflash/vlun.c b/drivers/scsi/cxlflash/vlun.c
index cbd5a648a131..35326e311991 100644
--- a/drivers/scsi/cxlflash/vlun.c
+++ b/drivers/scsi/cxlflash/vlun.c
@@ -819,8 +819,7 @@ int _cxlflash_vlun_resize(struct scsi_device *sdev,
return rc;
}
-int cxlflash_vlun_resize(struct scsi_device *sdev,
- struct dk_cxlflash_resize *resize)
+int cxlflash_vlun_resize(struct scsi_device *sdev, void *resize)
{
return _cxlflash_vlun_resize(sdev, NULL, resize);
}
@@ -1178,7 +1177,7 @@ static int clone_lxt(struct afu *afu,
/**
* cxlflash_disk_clone() - clone a context by making snapshot of another
* @sdev: SCSI device associated with LUN owning virtual LUN.
- * @clone: Clone ioctl data structure.
+ * @arg: Clone ioctl data structure.
*
* This routine effectively performs cxlflash_disk_open operation for each
* in-use virtual resource in the source context. Note that the destination
@@ -1187,9 +1186,9 @@ static int clone_lxt(struct afu *afu,
*
* Return: 0 on success, -errno on failure
*/
-int cxlflash_disk_clone(struct scsi_device *sdev,
- struct dk_cxlflash_clone *clone)
+int cxlflash_disk_clone(struct scsi_device *sdev, void *arg)
{
+ struct dk_cxlflash_clone *clone = arg;
struct cxlflash_cfg *cfg = shost_priv(sdev->host);
struct device *dev = &cfg->dev->dev;
struct llun_info *lli = sdev->hostdata;
--
2.39.2
Arnd,
> Calling a function through an incompatible pointer type causes breaks
> kcfi, so clang warns about the assignments:
>
> drivers/scsi/cxlflash/main.c:3498:3: error: cast from 'int (*)(struct
> cxlflash_cfg *, struct ht_cxlflash_lun_provision *)' to 'hioctl' (aka
> 'int (*)(struct cxlflash_cfg *, void *)') converts to incompatible
> function type [-Werror,-Wcast-function-type-strict]
> 3498 | (hioctl)cxlflash_lun_provision },
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/cxlflash/main.c:3500:3: error: cast from 'int (*)(struct
> cxlflash_cfg *, struct ht_cxlflash_afu_debug *)' to 'hioctl' (aka 'int
> (*)(struct cxlflash_cfg *, void *)') converts to incompatible function
> type [-Werror,-Wcast-function-type-strict]
> 3500 | (hioctl)cxlflash_afu_debug },
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Address these by changing the functions to have the correct type
> and replace the function pointer cast with a cast of its argument.
Applied to 6.10/scsi-staging, thanks!
--
Martin K. Petersen Oracle Linux Engineering
On Thu, 04 Apr 2024 18:14:58 +0200, Arnd Bergmann wrote:
> Calling a function through an incompatible pointer type causes breaks
> kcfi, so clang warns about the assignments:
>
> drivers/scsi/cxlflash/main.c:3498:3: error: cast from 'int (*)(struct cxlflash_cfg *, struct ht_cxlflash_lun_provision *)' to 'hioctl' (aka 'int (*)(struct cxlflash_cfg *, void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
> 3498 | (hioctl)cxlflash_lun_provision },
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/cxlflash/main.c:3500:3: error: cast from 'int (*)(struct cxlflash_cfg *, struct ht_cxlflash_afu_debug *)' to 'hioctl' (aka 'int (*)(struct cxlflash_cfg *, void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
> 3500 | (hioctl)cxlflash_afu_debug },
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~
>
> [...]
Applied to 6.10/scsi-queue, thanks!
[1/1] cxlflash: fix function pointer cast warnings
https://git.kernel.org/mkp/scsi/c/28fc2bd2c729
--
Martin K. Petersen Oracle Linux Engineering