[PATCH 06/42] ACPI: Introduce acpi_os_get_iomem()
From: Len Brown <lenb@kernel.org>
Date: 2011-03-23 06:43:18
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
From: Rafael J. Wysocki <redacted> 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 <redacted> --- drivers/acpi/osl.c | 16 ++++++++++++++++ include/linux/acpi_io.h | 2 ++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 5389f9f..52ca872 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)
diff --git a/include/linux/acpi_io.h b/include/linux/acpi_io.h
index 28a3ae2..4afd710 100644
--- a/include/linux/acpi_io.h
+++ b/include/linux/acpi_io.h@@ -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
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1.7.4.1.343.ga91df