[PATCH 2/3] drivers/base: devres.c: Add block copy func. for managed devices

[Rob Jones]

Add function devm_kmemdup().
Rationalise with devm_kstrdup() to avoid code duplication.

Reviewed-by: Ian Molton <ian.molton@xxxxxxxxxxxxxxx>
Signed-off-by: Rob Jones <rob.jones@xxxxxxxxxxxxxxx>
---
 drivers/base/devres.c  |   42 ++++++++++++++++++++++++++++++++++--------
 include/linux/device.h |    2 ++
 2 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index db4e264..978bbe2 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -791,6 +791,20 @@ void * devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
 EXPORT_SYMBOL_GPL(devm_kmalloc);
 
 /**
+ * static function to avoid code duplication when duplicating buffers
+ */
+static void *devm_kmemdup_nochecks(struct device *dev, const void *s,
+				    size_t size, gfp_t gfp)
+{
+	void *buf;
+
+	buf = devm_kmalloc(dev, size, gfp);
+	if (buf)
+		memcpy(buf, s, size);
+	return buf;
+}
+
+/**
  * devm_kstrdup - Allocate resource managed space and
  *                copy an existing string into that.
  * @dev: Device to allocate memory for
@@ -802,21 +816,33 @@ EXPORT_SYMBOL_GPL(devm_kmalloc);
  */
 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp)
 {
-	size_t size;
-	char *buf;
-
 	if (!s)
 		return NULL;
 
-	size = strlen(s) + 1;
-	buf = devm_kmalloc(dev, size, gfp);
-	if (buf)
-		memcpy(buf, s, size);
-	return buf;
+	return devm_kmemdup_nochecks(dev, s, (strlen(s)+1), gfp);
 }
 EXPORT_SYMBOL_GPL(devm_kstrdup);
 
 /**
+ * devm_kmemdup - Allocate resource managed space and
+ *                copy existing data into that.
+ * @dev: Device to allocate memory for
+ * @s: the memory block to duplicate
+ * @gfp: the GFP mask used in the devm_kmalloc() call when
+ *       allocating memory
+ * RETURNS:
+ * Pointer to allocated string on success, NULL on failure.
+ */
+void *devm_kmemdup(struct device *dev, const void *s, size_t size, gfp_t gfp)
+{
+	if (!s || (size == 0))
+		return NULL;
+
+	return devm_kmemdup_nochecks(dev, s, size, gfp);
+}
+EXPORT_SYMBOL_GPL(devm_kmemdup);
+
+/**
  * devm_kfree - Resource-managed kfree
  * @dev: Device this memory belongs to
  * @p: Memory to free
diff --git a/include/linux/device.h b/include/linux/device.h
index d1d1c05..7ace116 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -623,6 +623,8 @@ static inline void *devm_kcalloc(struct device *dev,
 }
 extern void devm_kfree(struct device *dev, void *p);
 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
+extern void *devm_kmemdup(struct device *dev,
+			  const void *s, size_t size, gfp_t gfp);
 
 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
 void __iomem *devm_request_and_ioremap(struct device *dev,
-- 
1.7.10.4

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