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authorLan Tianyu <tianyu.lan@intel.com>2011-06-30 11:34:12 +0800
committerLen Brown <len.brown@intel.com>2011-07-14 00:06:19 -0400
commit9c921c22a7f33397a6774d7fa076db9b6a0fd669 (patch)
treeca32ce369889d8a2f0b2e5f242dd0dd670ca3376 /drivers/acpi
parent6e17fb6aa1a67afa1827ae317c3594040f055730 (diff)
ACPI / Battery: Resolve the race condition in the sysfs_remove_battery()
Use battery->lock in sysfs_remove_battery() to make checking, removing, and clearing bat.dev atomic. This is necessary because sysfs_remove_battery() may be invoked concurrently from different paths. https://bugzilla.kernel.org/show_bug.cgi?id=35642 Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/battery.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 4ba339d0ea1..40bf01d42cc 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -573,11 +573,16 @@ static int sysfs_add_battery(struct acpi_battery *battery)
static void sysfs_remove_battery(struct acpi_battery *battery)
{
- if (!battery->bat.dev)
+ mutex_lock(&battery->lock);
+ if (!battery->bat.dev) {
+ mutex_unlock(&battery->lock);
return;
+ }
+
device_remove_file(battery->bat.dev, &alarm_attr);
power_supply_unregister(&battery->bat);
battery->bat.dev = NULL;
+ mutex_unlock(&battery->lock);
}
/*