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authorOleg Nesterov <oleg@tv-sign.ru>2006-08-22 21:22:13 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-08-22 12:04:55 -0700
commit4bf7989b2326fecad1181985f5fa9860d50fb89f (patch)
tree5708d8a0cd00254b51b61fe163d56d722fb9ecb3
parent7127be29378b1230eb8dd8b84f18d6b69c56e959 (diff)
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>
-rw-r--r--block/elevator.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c
index a0afdd317cef..7be96bbe142c 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -766,7 +766,8 @@ 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);