diff options
| author | Kiyoshi Ueda <k-ueda@ct.jp.nec.com> | 2009-10-16 18:18:15 -0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-10-16 18:18:15 -0400 |
| commit | f88fb981183e71daf40bbd84bc8251bbf7b59e19 (patch) | |
| tree | b1de0c32afb6a540624a0e53a25ce522a9935202 /drivers/md/dm-snap.c | |
| parent | 03022c54b9725026c0370a810168975c387ad04c (diff) | |
dm: dec_pending needs locking to save error value
Multiple instances of dec_pending() can run concurrently so a lock is
needed when it saves the first error code.
I have never experienced actual problem without locking and just found
this during code inspection while implementing the barrier support
patch for request-based dm.
This patch adds the locking.
I've done compile, boot and basic I/O testings.
Cc: stable@kernel.org
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap.c')
0 files changed, 0 insertions, 0 deletions