This is continuation of development of a proposed earlier
functionality to have multiple gen_pools per device, see
https://lkml.org/lkml/2015/6/8/588 discussion.
The main difference with the originally sent change is that instead of
adding two new interfaces gen_pool_get_named() and
devm_gen_pool_create_named(), it is considered better to change
signatures of the existing exported functions, because
devm_gen_pool_create() may be misused -- it is permitted to create
several gen_pool objects assigned to the same device and
gen_pool_get() returns only the first found object from device devres
data due to missing devres_match helper, fortunately currently
existing genalloc clients are not tainted -- at the moment the sole
user of devm_gen_pool_create() is drivers/misc/sram.c.
The change is split into two parts:
- update gen_pool_get() and devm_gen_pool_create() interfaces
on client side
- implement proper handling of new gen_pool "name" argument
and extend of_gen_pool_get() functionality based on it
Both changes are backward compatible in sense of functionality.
The lib/genalloc.c changes are based on two patches from -mm tree:
- http://ozlabs.org/~akpm/mmots/broken-out/genalloc-rename-dev_get_gen_pool-to-gen_pool_get.patch
- http://ozlabs.org/~akpm/mmots/broken-out/genalloc-rename-of_get_named_gen_pool-to-of_gen_pool_get.patch
The client side changes are based on linux-next/master branch.
Changes from v1 to v2:
- addressed Andrew's valuable review comments, namely
-- devm_gen_pool_create() is aware of attempts to register ambiguously
addressed gen_pool objects and now it returns ERR_PTR() on error,
-- memory management to store gen_pool name literal is done on
genalloc side,
-- replaced -1 with NUMA_NO_NODE in nid argument description,
- minor updates in of_gen_pool_get() change to respect OF_DYNAMIC
- instead of adding two new functions the existing functions
gen_pool_get() (at91, imx5m, imx6 and CODA driver clients) and
devm_gen_pool_create() (sram client) are updated.
Vladimir Zapolskiy (2):
genalloc: add name arg to gen_pool_get() and devm_gen_pool_create()
genalloc: add support of multiple gen_pools per device
arch/arm/mach-at91/pm.c | 2 +-
arch/arm/mach-imx/pm-imx5.c | 2 +-
arch/arm/mach-imx/pm-imx6.c | 2 +-
drivers/media/platform/coda/coda-common.c | 2 +-
drivers/misc/sram.c | 8 +--
include/linux/genalloc.h | 6 +-
lib/genalloc.c | 99 +++++++++++++++++++++++--------
7 files changed, 85 insertions(+), 36 deletions(-)
--
2.1.4
This change modifies gen_pool_get() and devm_gen_pool_create()
client interfaces adding one more argument "name" of a gen_pool
object.
Due to implementation gen_pool_get() is capable to retrieve only one
gen_pool associated with a device even if multiple gen_pools are
created, fortunately right at the moment it is sufficient for the
clients, hence provide NULL as a valid argument on both producer
devm_gen_pool_create() and consumer gen_pool_get() sides.
Because only one created gen_pool per device is addressable,
explicitly add a restriction to devm_gen_pool_create() to create only
one gen_pool per device, this implies two possible error codes
returned by the function, account it on client side (only misc/sram).
This completes client side changes related to genalloc updates.
Signed-off-by: Vladimir Zapolskiy <[email protected]>
---
arch/arm/mach-at91/pm.c | 2 +-
arch/arm/mach-imx/pm-imx5.c | 2 +-
arch/arm/mach-imx/pm-imx6.c | 2 +-
drivers/media/platform/coda/coda-common.c | 2 +-
drivers/misc/sram.c | 8 ++---
include/linux/genalloc.h | 4 +--
lib/genalloc.c | 49 ++++++++++++++++++-------------
7 files changed, 38 insertions(+), 31 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index e24df77..e65e9db 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -369,7 +369,7 @@ static void __init at91_pm_sram_init(void)
return;
}
- sram_pool = gen_pool_get(&pdev->dev);
+ sram_pool = gen_pool_get(&pdev->dev, NULL);
if (!sram_pool) {
pr_warn("%s: sram pool unavailable!\n", __func__);
return;
diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c
index 1885676..532d4b0 100644
--- a/arch/arm/mach-imx/pm-imx5.c
+++ b/arch/arm/mach-imx/pm-imx5.c
@@ -297,7 +297,7 @@ static int __init imx_suspend_alloc_ocram(
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index 93ecf55..8ff8fc0 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -451,7 +451,7 @@ static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 58f6548..284ac4c 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -2157,7 +2157,7 @@ static int coda_probe(struct platform_device *pdev)
/* Get IRAM pool from device tree or platform data */
pool = of_gen_pool_get(np, "iram", 0);
if (!pool && pdata)
- pool = gen_pool_get(pdata->iram_dev);
+ pool = gen_pool_get(pdata->iram_dev, NULL);
if (!pool) {
dev_err(&pdev->dev, "iram pool not available\n");
return -ENOMEM;
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 15c33cc..431e1dd 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -186,10 +186,10 @@ static int sram_probe(struct platform_device *pdev)
if (IS_ERR(sram->virt_base))
return PTR_ERR(sram->virt_base);
- sram->pool = devm_gen_pool_create(sram->dev,
- ilog2(SRAM_GRANULARITY), -1);
- if (!sram->pool)
- return -ENOMEM;
+ sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
+ NUMA_NO_NODE, NULL);
+ if (IS_ERR(sram->pool))
+ return PTR_ERR(sram->pool);
ret = sram_reserve_regions(sram, res);
if (ret)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 5383bb1..6afa65e 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -118,8 +118,8 @@ extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data);
extern struct gen_pool *devm_gen_pool_create(struct device *dev,
- int min_alloc_order, int nid);
-extern struct gen_pool *gen_pool_get(struct device *dev);
+ int min_alloc_order, int nid, const char *name);
+extern struct gen_pool *gen_pool_get(struct device *dev, const char *name);
bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
size_t size);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index daf0afb..7cf19a5 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -571,23 +571,46 @@ static void devm_gen_pool_release(struct device *dev, void *res)
}
/**
+ * gen_pool_get - Obtain the gen_pool (if any) for a device
+ * @dev: device to retrieve the gen_pool from
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
+ *
+ * Returns the gen_pool for the device if one is present, or NULL.
+ */
+struct gen_pool *gen_pool_get(struct device *dev, const char *name)
+{
+ struct gen_pool **p = devres_find(dev, devm_gen_pool_release,
+ NULL, NULL);
+
+ if (!p)
+ return NULL;
+ return *p;
+}
+EXPORT_SYMBOL_GPL(gen_pool_get);
+
+/**
* devm_gen_pool_create - managed gen_pool_create
* @dev: device that provides the gen_pool
* @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
- * @nid: node id of the node the pool structure should be allocated on, or -1
+ * @nid: node selector for allocated gen_pool, %NUMA_NO_NODE for all nodes
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
*
* Create a new special memory pool that can be used to manage special purpose
* memory not managed by the regular kmalloc/kfree interface. The pool will be
* automatically destroyed by the device management code.
*/
struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
- int nid)
+ int nid, const char *name)
{
struct gen_pool **ptr, *pool;
+ /* Check that genpool to be created is uniquely addressed on device */
+ if (gen_pool_get(dev, name))
+ return ERR_PTR(-EINVAL);
+
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
- return NULL;
+ return ERR_PTR(-ENOMEM);
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
@@ -595,29 +618,13 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
devres_add(dev, ptr);
} else {
devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
}
return pool;
}
EXPORT_SYMBOL(devm_gen_pool_create);
-/**
- * gen_pool_get - Obtain the gen_pool (if any) for a device
- * @dev: device to retrieve the gen_pool from
- *
- * Returns the gen_pool for the device if one is present, or NULL.
- */
-struct gen_pool *gen_pool_get(struct device *dev)
-{
- struct gen_pool **p = devres_find(dev, devm_gen_pool_release, NULL,
- NULL);
-
- if (!p)
- return NULL;
- return *p;
-}
-EXPORT_SYMBOL_GPL(gen_pool_get);
-
#ifdef CONFIG_OF
/**
* of_gen_pool_get - find a pool by phandle property
@@ -642,7 +649,7 @@ struct gen_pool *of_gen_pool_get(struct device_node *np,
of_node_put(np_pool);
if (!pdev)
return NULL;
- return gen_pool_get(&pdev->dev);
+ return gen_pool_get(&pdev->dev, NULL);
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */
--
2.1.4
This change fills devm_gen_pool_create()/gen_pool_get() "name"
argument stub with contents and extends of_gen_pool_get()
functionality on this basis.
If there is no associated platform device with a device node passed to
of_gen_pool_get(), the function attempts to get a label property or
device node name (= repeats MTD OF partition standard) and seeks for a
named gen_pool registered by device of the parent device node.
The main idea of the change is to allow registration of independent
gen_pools under the same umbrella device, say "partitions" on "storage
device", the original functionality of one "partition" per "storage
device" is untouched.
Signed-off-by: Vladimir Zapolskiy <[email protected]>
---
include/linux/genalloc.h | 2 ++
lib/genalloc.c | 54 +++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 49 insertions(+), 7 deletions(-)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 6afa65e..7ff168d 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -59,6 +59,8 @@ struct gen_pool {
genpool_algo_t algo; /* allocation function */
void *data;
+
+ const char *name;
};
/*
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 7cf19a5..259582b 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -160,6 +160,7 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
pool->min_alloc_order = min_alloc_order;
pool->algo = gen_pool_first_fit;
pool->data = NULL;
+ pool->name = NULL;
}
return pool;
}
@@ -252,8 +253,8 @@ void gen_pool_destroy(struct gen_pool *pool)
kfree(chunk);
}
+ kfree(pool->name);
kfree(pool);
- return;
}
EXPORT_SYMBOL(gen_pool_destroy);
@@ -570,6 +571,20 @@ static void devm_gen_pool_release(struct device *dev, void *res)
gen_pool_destroy(*(struct gen_pool **)res);
}
+static int devm_gen_pool_match(struct device *dev, void *res, void *data)
+{
+ struct gen_pool **p = res;
+
+ /* NULL data matches only a pool without an assigned name */
+ if (!data && !(*p)->name)
+ return 1;
+
+ if (!data || !(*p)->name)
+ return 0;
+
+ return !strcmp((*p)->name, data);
+}
+
/**
* gen_pool_get - Obtain the gen_pool (if any) for a device
* @dev: device to retrieve the gen_pool from
@@ -580,7 +595,7 @@ static void devm_gen_pool_release(struct device *dev, void *res)
struct gen_pool *gen_pool_get(struct device *dev, const char *name)
{
struct gen_pool **p = devres_find(dev, devm_gen_pool_release,
- NULL, NULL);
+ devm_gen_pool_match, (void *)name);
if (!p)
return NULL;
@@ -603,21 +618,32 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
int nid, const char *name)
{
struct gen_pool **ptr, *pool;
+ const char *pool_name = NULL;
/* Check that genpool to be created is uniquely addressed on device */
if (gen_pool_get(dev, name))
return ERR_PTR(-EINVAL);
+ if (name) {
+ pool_name = kstrdup_const(name, GFP_KERNEL);
+ if (!pool_name)
+ return ERR_PTR(-ENOMEM);
+ }
+
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
+ if (!ptr) {
+ kfree(pool_name);
return ERR_PTR(-ENOMEM);
+ }
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
*ptr = pool;
+ pool->name = pool_name;
devres_add(dev, ptr);
} else {
devres_free(ptr);
+ kfree(pool_name);
return ERR_PTR(-ENOMEM);
}
@@ -640,16 +666,30 @@ struct gen_pool *of_gen_pool_get(struct device_node *np,
const char *propname, int index)
{
struct platform_device *pdev;
- struct device_node *np_pool;
+ struct device_node *np_pool, *parent;
+ const char *name = NULL;
+ struct gen_pool *pool = NULL;
np_pool = of_parse_phandle(np, propname, index);
if (!np_pool)
return NULL;
+
pdev = of_find_device_by_node(np_pool);
+ if (!pdev) {
+ /* Check if named gen_pool is created by parent node device */
+ parent = of_get_parent(np_pool);
+ pdev = of_find_device_by_node(parent);
+ of_node_put(parent);
+
+ of_property_read_string(np_pool, "label", &name);
+ if (!name)
+ name = np_pool->name;
+ }
+ if (pdev)
+ pool = gen_pool_get(&pdev->dev, name);
of_node_put(np_pool);
- if (!pdev)
- return NULL;
- return gen_pool_get(&pdev->dev, NULL);
+
+ return pool;
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */
--
2.1.4
This change modifies gen_pool_get() and devm_gen_pool_create() client
interfaces adding one more argument "name" of a gen_pool object.
Due to implementation gen_pool_get() is capable to retrieve only one
gen_pool associated with a device even if multiple gen_pools are created,
fortunately right at the moment it is sufficient for the clients, hence
provide NULL as a valid argument on both producer devm_gen_pool_create()
and consumer gen_pool_get() sides.
Because only one created gen_pool per device is addressable, explicitly
add a restriction to devm_gen_pool_create() to create only one gen_pool
per device, this implies two possible error codes returned by the
function, account it on client side (only misc/sram). This completes
client side changes related to genalloc updates.
Signed-off-by: Vladimir Zapolskiy <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Russell King <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Jean-Christophe Plagniol-Villard <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dinh Nguyen <[email protected]>
---
Changes from v1 to v2:
* Added the same change in gen_pool_get() argument list
to account a recently added client in arm/mach-socfpga/pm.c
arch/arm/mach-at91/pm.c | 2 +-
arch/arm/mach-imx/pm-imx5.c | 2 +-
arch/arm/mach-imx/pm-imx6.c | 2 +-
arch/arm/mach-socfpga/pm.c | 2 +-
drivers/media/platform/coda/coda-common.c | 2 +-
drivers/misc/sram.c | 8 ++---
include/linux/genalloc.h | 4 +--
lib/genalloc.c | 49 ++++++++++++++++++-------------
8 files changed, 39 insertions(+), 32 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index e24df77..e65e9db 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -369,7 +369,7 @@ static void __init at91_pm_sram_init(void)
return;
}
- sram_pool = gen_pool_get(&pdev->dev);
+ sram_pool = gen_pool_get(&pdev->dev, NULL);
if (!sram_pool) {
pr_warn("%s: sram pool unavailable!\n", __func__);
return;
diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c
index 1885676..532d4b0 100644
--- a/arch/arm/mach-imx/pm-imx5.c
+++ b/arch/arm/mach-imx/pm-imx5.c
@@ -297,7 +297,7 @@ static int __init imx_suspend_alloc_ocram(
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index 93ecf55..8ff8fc0 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -451,7 +451,7 @@ static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/arch/arm/mach-socfpga/pm.c b/arch/arm/mach-socfpga/pm.c
index 6a4199f..c378ab0 100644
--- a/arch/arm/mach-socfpga/pm.c
+++ b/arch/arm/mach-socfpga/pm.c
@@ -56,7 +56,7 @@ static int socfpga_setup_ocram_self_refresh(void)
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 58f6548..284ac4c 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -2157,7 +2157,7 @@ static int coda_probe(struct platform_device *pdev)
/* Get IRAM pool from device tree or platform data */
pool = of_gen_pool_get(np, "iram", 0);
if (!pool && pdata)
- pool = gen_pool_get(pdata->iram_dev);
+ pool = gen_pool_get(pdata->iram_dev, NULL);
if (!pool) {
dev_err(&pdev->dev, "iram pool not available\n");
return -ENOMEM;
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 15c33cc..431e1dd 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -186,10 +186,10 @@ static int sram_probe(struct platform_device *pdev)
if (IS_ERR(sram->virt_base))
return PTR_ERR(sram->virt_base);
- sram->pool = devm_gen_pool_create(sram->dev,
- ilog2(SRAM_GRANULARITY), -1);
- if (!sram->pool)
- return -ENOMEM;
+ sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
+ NUMA_NO_NODE, NULL);
+ if (IS_ERR(sram->pool))
+ return PTR_ERR(sram->pool);
ret = sram_reserve_regions(sram, res);
if (ret)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 5383bb1..6afa65e 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -118,8 +118,8 @@ extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data);
extern struct gen_pool *devm_gen_pool_create(struct device *dev,
- int min_alloc_order, int nid);
-extern struct gen_pool *gen_pool_get(struct device *dev);
+ int min_alloc_order, int nid, const char *name);
+extern struct gen_pool *gen_pool_get(struct device *dev, const char *name);
bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
size_t size);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index daf0afb..7cf19a5 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -571,23 +571,46 @@ static void devm_gen_pool_release(struct device *dev, void *res)
}
/**
+ * gen_pool_get - Obtain the gen_pool (if any) for a device
+ * @dev: device to retrieve the gen_pool from
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
+ *
+ * Returns the gen_pool for the device if one is present, or NULL.
+ */
+struct gen_pool *gen_pool_get(struct device *dev, const char *name)
+{
+ struct gen_pool **p = devres_find(dev, devm_gen_pool_release,
+ NULL, NULL);
+
+ if (!p)
+ return NULL;
+ return *p;
+}
+EXPORT_SYMBOL_GPL(gen_pool_get);
+
+/**
* devm_gen_pool_create - managed gen_pool_create
* @dev: device that provides the gen_pool
* @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
- * @nid: node id of the node the pool structure should be allocated on, or -1
+ * @nid: node selector for allocated gen_pool, %NUMA_NO_NODE for all nodes
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
*
* Create a new special memory pool that can be used to manage special purpose
* memory not managed by the regular kmalloc/kfree interface. The pool will be
* automatically destroyed by the device management code.
*/
struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
- int nid)
+ int nid, const char *name)
{
struct gen_pool **ptr, *pool;
+ /* Check that genpool to be created is uniquely addressed on device */
+ if (gen_pool_get(dev, name))
+ return ERR_PTR(-EINVAL);
+
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
- return NULL;
+ return ERR_PTR(-ENOMEM);
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
@@ -595,29 +618,13 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
devres_add(dev, ptr);
} else {
devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
}
return pool;
}
EXPORT_SYMBOL(devm_gen_pool_create);
-/**
- * gen_pool_get - Obtain the gen_pool (if any) for a device
- * @dev: device to retrieve the gen_pool from
- *
- * Returns the gen_pool for the device if one is present, or NULL.
- */
-struct gen_pool *gen_pool_get(struct device *dev)
-{
- struct gen_pool **p = devres_find(dev, devm_gen_pool_release, NULL,
- NULL);
-
- if (!p)
- return NULL;
- return *p;
-}
-EXPORT_SYMBOL_GPL(gen_pool_get);
-
#ifdef CONFIG_OF
/**
* of_gen_pool_get - find a pool by phandle property
@@ -642,7 +649,7 @@ struct gen_pool *of_gen_pool_get(struct device_node *np,
of_node_put(np_pool);
if (!pdev)
return NULL;
- return gen_pool_get(&pdev->dev);
+ return gen_pool_get(&pdev->dev, NULL);
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */
--
2.1.4