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authorRafael J. Wysocki <rjw@sisk.pl>2011-02-09 01:37:42 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2011-02-24 21:58:41 +0300
commit7bbb890358b96cb6f77adc6815f2072bdf813d5d (patch)
tree56d110312dd7ee4b5a49ae48bd9845ff95a5e7bb /drivers/acpi/osl.c
parent073b4964b3b75fd9e19bf3933b26d9c23591c9db (diff)
downloadlinux-7bbb890358b96cb6f77adc6815f2072bdf813d5d.tar.xz
ACPI: Change acpi_ioremap_lock into a mutex
There's no reason why acpi_ioremap_lock has to be a spinlock, because all of the functions it is used in may sleep anyway and there's no reason why it should be locked with interrupts off. Use a mutex instead (that's going to allow us to put some more operations under the lock later). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/acpi/osl.c')
-rw-r--r--drivers/acpi/osl.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index ff2189d3fa06..97061928249a 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -109,7 +109,7 @@ struct acpi_ioremap {
};
static LIST_HEAD(acpi_ioremaps);
-static DEFINE_SPINLOCK(acpi_ioremap_lock);
+static DEFINE_MUTEX(acpi_ioremap_lock);
static void __init acpi_osi_setup_late(void);
@@ -303,7 +303,6 @@ void __iomem *__init_refok
acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
struct acpi_ioremap *map, *tmp_map;
- unsigned long flags;
void __iomem *virt;
acpi_physical_address pg_off;
acpi_size pg_sz;
@@ -334,18 +333,18 @@ acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
map->size = pg_sz;
kref_init(&map->ref);
- spin_lock_irqsave(&acpi_ioremap_lock, flags);
+ mutex_lock(&acpi_ioremap_lock);
/* Check if page has already been mapped. */
tmp_map = acpi_map_lookup(phys, size);
if (tmp_map) {
kref_get(&tmp_map->ref);
- spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
+ mutex_unlock(&acpi_ioremap_lock);
iounmap(map->virt);
kfree(map);
return tmp_map->virt + (phys - tmp_map->phys);
}
list_add_tail_rcu(&map->list, &acpi_ioremaps);
- spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
+ mutex_unlock(&acpi_ioremap_lock);
return map->virt + (phys - map->phys);
}
@@ -362,7 +361,6 @@ static void acpi_kref_del_iomap(struct kref *ref)
void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
- unsigned long flags;
int del;
if (!acpi_gbl_permanent_mmap) {
@@ -370,17 +368,17 @@ void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
return;
}
- spin_lock_irqsave(&acpi_ioremap_lock, flags);
+ mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup_virt(virt, size);
if (!map) {
- spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
+ mutex_unlock(&acpi_ioremap_lock);
printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt);
dump_stack();
return;
}
del = kref_put(&map->ref, acpi_kref_del_iomap);
- spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
+ mutex_unlock(&acpi_ioremap_lock);
if (!del)
return;
@@ -417,7 +415,6 @@ static int acpi_os_map_generic_address(struct acpi_generic_address *addr)
static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
{
void __iomem *virt;
- unsigned long flags;
acpi_size size = addr->bit_width / 8;
if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
@@ -426,9 +423,9 @@ static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr)
if (!addr->address || !addr->bit_width)
return;
- spin_lock_irqsave(&acpi_ioremap_lock, flags);
+ mutex_lock(&acpi_ioremap_lock);
virt = acpi_map_vaddr_lookup(addr->address, size);
- spin_unlock_irqrestore(&acpi_ioremap_lock, flags);
+ mutex_unlock(&acpi_ioremap_lock);
acpi_os_unmap_memory(virt, size);
}