devm_kmalloc() is identical to kmalloc() except that the memory
allocated with it is managed and will be automatically released
when the device is removed/unbound.
Likewise for the other variants.
Signed-off-by: Masahiro Yamada yamada.masah...@socionext.com
---
drivers/core/devres.c | 21 +
include/dm/device.h | 23 +++
2 files changed, 44 insertions(+)
diff --git a/drivers/core/devres.c b/drivers/core/devres.c
index 2e967bf..f24bcac 100644
--- a/drivers/core/devres.c
+++ b/drivers/core/devres.c
@@ -135,3 +135,24 @@ void devres_release_all(struct udevice *dev)
{
release_nodes(dev, dev-devres_head, false);
}
+
+/*
+ * Managed kmalloc/kfree
+ */
+static void devm_kmalloc_release(struct udevice *dev, void *res)
+{
+ /* noop */
+}
+
+void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
+{
+ void *data;
+
+ data = devres_alloc(devm_kmalloc_release, size, gfp);
+ if (unlikely(!data))
+ return NULL;
+
+ devres_add(dev, data);
+
+ return data;
+}
diff --git a/include/dm/device.h b/include/dm/device.h
index 7b39659..fac0868 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -14,6 +14,8 @@
#include dm/uclass-id.h
#include fdtdec.h
#include linker_lists.h
+#include linux/compat.h
+#include linux/kernel.h
#include linux/list.h
struct driver_info;
@@ -466,4 +468,25 @@ void devres_add(struct udevice *dev, void *res);
void devres_release_probe(struct udevice *dev);
void devres_release_all(struct udevice *dev);
+/* managed devm_k.alloc/kfree for device drivers */
+void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp);
+static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
+{
+ return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
+}
+static inline void *devm_kmalloc_array(struct udevice *dev,
+ size_t n, size_t size, gfp_t flags)
+{
+ if (size != 0 n SIZE_MAX / size)
+ return NULL;
+ return devm_kmalloc(dev, n * size, flags);
+}
+static inline void *devm_kcalloc(struct udevice *dev,
+size_t n, size_t size, gfp_t flags)
+{
+ return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
+}
+void devm_kfree(struct udevice *dev, void *p);
+
+
#endif
--
1.9.1
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