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| author | Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | 2013-10-11 10:36:25 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-17 05:42:41 +0400 |
| commit | a37f86305c80f441b8b99dae7c19d3f9d2effc15 (patch) | |
| tree | 98ba5fa9043c6e141630e205cb84fcbcfb3d0225 | |
| parent | 15c03dd4859ab16f9212238f29dd315654aa94f6 (diff) | |
| download | linux-a37f86305c80f441b8b99dae7c19d3f9d2effc15.tar.xz | |
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.c | 7 |
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) |