Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7d3dcf26 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Dan Williams
Browse files

devres: add devm_memremap 



Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent e836a256

include/linux/io.h

+4 −0
Original line number Diff line number Diff line
@@ -80,6 +80,10 @@ int check_signature(const volatile void __iomem *io_addr, 
			const unsigned char *signature, int length);

void devm_ioremap_release(struct device *dev, void *res);



void *devm_memremap(struct device *dev, resource_size_t offset,

		size_t size, unsigned long flags);

void devm_memunmap(struct device *dev, void *addr);



/*

 * Some systems do not have legacy ISA devices.

 * /dev/port is not a valid interface on these systems.

kernel/memremap.c

+39 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 */

#include <linux/device.h>

#include <linux/types.h>

#include <linux/io.h>

#include <linux/mm.h>
@@ -96,3 +97,41 @@ void memunmap(void *addr) 
		iounmap((void __iomem *) addr);

}

EXPORT_SYMBOL(memunmap);



static void devm_memremap_release(struct device *dev, void *res)

{

	memunmap(res);

}



static int devm_memremap_match(struct device *dev, void *res, void *match_data)

{

	return *(void **)res == match_data;

}



void *devm_memremap(struct device *dev, resource_size_t offset,

		size_t size, unsigned long flags)

{

	void **ptr, *addr;



	ptr = devres_alloc(devm_memremap_release, sizeof(*ptr), GFP_KERNEL);

	if (!ptr)

		return NULL;



	addr = memremap(offset, size, flags);

	if (addr) {

		*ptr = addr;

		devres_add(dev, ptr);

	} else

		devres_free(ptr);



	return addr;

}

EXPORT_SYMBOL(devm_memremap);



void devm_memunmap(struct device *dev, void *addr)

{

	WARN_ON(devres_destroy(dev, devm_memremap_release, devm_memremap_match,

			       addr));

	memunmap(addr);

}

EXPORT_SYMBOL(devm_memunmap);