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devres: add devm_memremap 

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig 2015-08-10 23:07:07 -04:00 committed by Dan Williams
parent e836a256e8
commit 7d3dcf26a6
2 changed files with 43 additions and 0 deletions
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4
include/linux/io.h
View File

@ -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.

39
kernel/memremap.c
View File

@ -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);