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Commit e31108ca authored by Manish Badarkhe's avatar Manish Badarkhe Committed by Mark Brown
Browse files

devres: introduce API "devm_kstrdup" 



This patch introduces "devm_kstrdup" API so that the
device's driver can allocate memory and copy string.

Signed-off-by: default avatarManish Badarkhe <badarkhe.manish@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 38dbfb59

drivers/base/devres.c

+26 −0
Original line number Diff line number Diff line
@@ -790,6 +790,32 @@ void * devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) 
}

EXPORT_SYMBOL_GPL(devm_kmalloc);



/**

 * devm_kstrdup - Allocate resource managed space and

 *                copy an existing string into that.

 * @dev: Device to allocate memory for

 * @s: the string 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.

 */

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;

}

EXPORT_SYMBOL_GPL(devm_kstrdup);



/**

 * devm_kfree - Resource-managed kfree

 * @dev: Device this memory belongs to

include/linux/device.h

+1 −0
Original line number Diff line number Diff line
@@ -626,6 +626,7 @@ static inline void *devm_kcalloc(struct device *dev, 
	return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);

}

extern void devm_kfree(struct device *dev, void *p);

extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);



void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);

void __iomem *devm_request_and_ioremap(struct device *dev,