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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-08 23:38:25 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-24 19:58:42 +0100 |
| commit | 13606a2de1996f8d83a9ce296f74022bdbadf712 (patch) | |
| tree | 02ad0403378ad222dd1ed021ed80fe10fe9a6b39 /drivers/acpi/osl.c | |
| parent | ACPI: Do not use krefs under a mutex in osl.c (diff) | |
| download | linux-13606a2de1996f8d83a9ce296f74022bdbadf712.tar.xz linux-13606a2de1996f8d83a9ce296f74022bdbadf712.zip | |
ACPI: Introduce acpi_os_get_iomem()
Introduce function acpi_os_get_iomem() that may be used by its callers
to get a reference to an ACPI iomap.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 5389f9f2e2ff..52ca8721bc9c 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -285,6 +285,22 @@ acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) return NULL; } +void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) +{ + struct acpi_ioremap *map; + void __iomem *virt = NULL; + + mutex_lock(&acpi_ioremap_lock); + map = acpi_map_lookup(phys, size); + if (map) { + virt = map->virt + (phys - map->phys); + map->refcount++; + } + mutex_unlock(&acpi_ioremap_lock); + return virt; +} +EXPORT_SYMBOL_GPL(acpi_os_get_iomem); + /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ static struct acpi_ioremap * acpi_map_lookup_virt(void __iomem *virt, acpi_size size) |