Commit 13606a2d authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

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: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent b7c1fadd

drivers/acpi/osl.c

+16 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/acpi_io.h

+2 −0
Original line number Diff line number Diff line
@@ -10,4 +10,6 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, 
       return ioremap_cache(phys, size);

}



void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size);



#endif