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-rw-r--r--lib/genalloc.c110
1 files changed, 80 insertions, 30 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c
index daf0afb6d979..116a166b096f 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_const(pool->name);
kfree(pool);
- return;
}
EXPORT_SYMBOL(gen_pool_destroy);
@@ -570,53 +571,88 @@ 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
+ * @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;
+
+ p = devres_find(dev, devm_gen_pool_release, devm_gen_pool_match,
+ (void *)name);
+ 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;
+ 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)
- return NULL;
+ goto free_pool_name;
pool = gen_pool_create(min_alloc_order, nid);
- if (pool) {
- *ptr = pool;
- devres_add(dev, ptr);
- } else {
- devres_free(ptr);
- }
+ if (!pool)
+ goto free_devres;
+
+ *ptr = pool;
+ pool->name = pool_name;
+ devres_add(dev, ptr);
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);
+free_devres:
+ devres_free(ptr);
+free_pool_name:
+ kfree_const(pool_name);
- if (!p)
- return NULL;
- return *p;
+ return ERR_PTR(-ENOMEM);
}
-EXPORT_SYMBOL_GPL(gen_pool_get);
+EXPORT_SYMBOL(devm_gen_pool_create);
#ifdef CONFIG_OF
/**
@@ -633,16 +669,30 @@ 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);
+
+ return pool;
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */

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