tree 7e6878d6391919019b4904714cfe8fc0ef4709be
parent 00a2b0f6dd2372842df73de72d51621b539fea44
author Oleg Nesterov <oleg@tv-sign.ru> 1156267333 +0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1156276343 -0700

elv_unregister: fix possible crash on module unload

An exiting task or process which didn't do I/O yet have no io context,
elv_unregister() should check it is not NULL.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>