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authorYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>2013-10-11 15:36:25 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-16 18:42:41 -0700
commita37f86305c80f441b8b99dae7c19d3f9d2effc15 (patch)
tree98ba5fa9043c6e141630e205cb84fcbcfb3d0225
parent15c03dd4859ab16f9212238f29dd315654aa94f6 (diff)
downloadleg-kernel-a37f86305c80f441b8b99dae7c19d3f9d2effc15.tar.gz
driver core: Release device_hotplug_lock when store_mem_state returns EINVAL
When inserting a wrong value to /sys/devices/system/memory/memoryX/state file, following messages are shown. And device_hotplug_lock is never released. ================================================ [ BUG: lock held when returning to user space! ] 3.12.0-rc4-debug+ #3 Tainted: G W ------------------------------------------------ bash/6442 is leaving the kernel with locks still held! 1 lock held by bash/6442: #0: (device_hotplug_lock){+.+.+.}, at: [<ffffffff8146cbb5>] lock_device_hotplug_sysfs+0x15/0x50 This issue was introdued by commit fa2be40 (drivers: base: use standard device online/offline for state change). This patch releases device_hotplug_lcok when store_mem_state returns EINVAL. Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Reviewed-by: Toshi Kani <toshi.kani@hp.com> CC: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/base/memory.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 9e59f6535c44..bece691cb5d9 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -333,8 +333,10 @@ store_mem_state(struct device *dev,
online_type = ONLINE_KEEP;
else if (!strncmp(buf, "offline", min_t(int, count, 7)))
online_type = -1;
- else
- return -EINVAL;
+ else {
+ ret = -EINVAL;
+ goto err;
+ }
switch (online_type) {
case ONLINE_KERNEL:
@@ -357,6 +359,7 @@ store_mem_state(struct device *dev,
ret = -EINVAL; /* should never happen */
}
+err:
unlock_device_hotplug();
if (ret)