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authorShaohua Li <shaohua.li@intel.com>2009-04-07 10:24:29 +0800
committerLen Brown <len.brown@intel.com>2009-04-07 00:02:40 -0400
commit9090589d87506c578ea1523ffd7ae7fd9424fb28 (patch)
tree215163d13dbfa514a4121594cd4c6e27fde9b911 /drivers/acpi/scan.c
parentd508afb437daee7cf07da085b635c44a4ebf9b38 (diff)
downloadlinux-linaro-android-9090589d87506c578ea1523ffd7ae7fd9424fb28.tar.gz
ACPI: convert acpi_device_lock spinlock to mutex
Convert acpi_device_lock to a mutex to avoid a potential race upon access to /proc/acpi/wakeup Delete the lock entirely in wakeup.c since it is not necessary (and can not sleep) Found-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 20c23c04920..e63f2febad8 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -24,7 +24,7 @@ extern struct acpi_device *acpi_root;
static LIST_HEAD(acpi_device_list);
static LIST_HEAD(acpi_bus_id_list);
-DEFINE_SPINLOCK(acpi_device_lock);
+DEFINE_MUTEX(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);
struct acpi_device_bus_id{
@@ -500,7 +500,7 @@ static int acpi_device_register(struct acpi_device *device,
return -ENOMEM;
}
- spin_lock(&acpi_device_lock);
+ mutex_lock(&acpi_device_lock);
/*
* Find suitable bus_id and instance number in acpi_bus_id_list
* If failed, create one and link it into acpi_bus_id_list
@@ -528,7 +528,7 @@ static int acpi_device_register(struct acpi_device *device,
list_add_tail(&device->g_list, &acpi_device_list);
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
- spin_unlock(&acpi_device_lock);
+ mutex_unlock(&acpi_device_lock);
if (device->parent)
device->dev.parent = &parent->dev;
@@ -549,20 +549,20 @@ static int acpi_device_register(struct acpi_device *device,
device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
return 0;
end:
- spin_lock(&acpi_device_lock);
+ mutex_lock(&acpi_device_lock);
if (device->parent) {
list_del(&device->node);
list_del(&device->g_list);
} else
list_del(&device->g_list);
list_del(&device->wakeup_list);
- spin_unlock(&acpi_device_lock);
+ mutex_unlock(&acpi_device_lock);
return result;
}
static void acpi_device_unregister(struct acpi_device *device, int type)
{
- spin_lock(&acpi_device_lock);
+ mutex_lock(&acpi_device_lock);
if (device->parent) {
list_del(&device->node);
list_del(&device->g_list);
@@ -570,7 +570,7 @@ static void acpi_device_unregister(struct acpi_device *device, int type)
list_del(&device->g_list);
list_del(&device->wakeup_list);
- spin_unlock(&acpi_device_lock);
+ mutex_unlock(&acpi_device_lock);
acpi_detach_data(device->handle, acpi_bus_data_handler);