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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>
This commit is contained in:
Oleg Nesterov 2006-08-22 21:22:13 +04:00 committed by Greg Kroah-Hartman
parent 00a2b0f6dd
commit 2d8f613160
1 changed files with 2 additions and 1 deletions
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3
block/elevator.c
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@ -765,7 +765,8 @@ void elv_unregister(struct elevator_type *e)
read_lock(&tasklist_lock);
do_each_thread(g, p) {
task_lock(p);
e->ops.trim(p->io_context);
if (p->io_context)
e->ops.trim(p->io_context);
task_unlock(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);