From 61014e96e6ed55b8db0af31574eec2a75d4e8755 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Fri, 1 Oct 2010 14:49:44 +0200 Subject: [PATCH] blkio: deletion of a cgroup was causes oops o Now a cgroup list of blkg elements can contain blkg from multiple policies. Before sending an unlink event, make sure blkg belongs to they policy. If policy does not own the blkg, do not send update for this blkg. Signed-off-by: Vivek Goyal Signed-off-by: Jens Axboe --- block/blk-cgroup.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 86e7066a0b62..b06ca70354e3 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1411,13 +1411,14 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) /* * This blkio_group is being unlinked as associated cgroup is * going away. Let all the IO controlling policies know about - * this event. Currently this is static call to one io - * controlling policy. Once we have more policies in place, we - * need some dynamic registration of callback function. + * this event. */ spin_lock(&blkio_list_lock); - list_for_each_entry(blkiop, &blkio_list, list) + list_for_each_entry(blkiop, &blkio_list, list) { + if (blkiop->plid != blkg->plid) + continue; blkiop->ops.blkio_unlink_group_fn(key, blkg); + } spin_unlock(&blkio_list_lock); } while (1);