On Thu, Mar 12 2015 at 9:51am -0400, Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > On Thu, Mar 12 2015 at 3:48am -0400, > Ming Lei <tom.leiming@xxxxxxxxx> wrote: > > > On Thu, Mar 12, 2015 at 11:56 AM, Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > > > If percpu_ref_init() fails the 'err_hctxs' label should be used instead > > > of 'err_map'. > > > > > > Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> > > > --- > > > block/blk-mq.c | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/block/blk-mq.c b/block/blk-mq.c > > > index 4f4bea2..459840c 100644 > > > --- a/block/blk-mq.c > > > +++ b/block/blk-mq.c > > > @@ -1938,7 +1938,7 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) > > > */ > > > if (percpu_ref_init(&q->mq_usage_counter, blk_mq_usage_counter_release, > > > PERCPU_REF_INIT_ATOMIC, GFP_KERNEL)) > > > - goto err_map; > > > + goto err_hctxs; > > > > If it is changed to 'goto err_hctxs', percpu_ref_init() need to > > move before blk_alloc_queue_node(), otherwise just 'goto err_hw' > > is enough, but the former is better. > > Yes, you're correct. Patch 2 happened to eliminate this problem. But > I'll get it fixed up and post v2. Actually, percpu_ref_init clearly cannot go before blk_alloc_queue_node since percpu_ref_init deferences q. (buildbot just emailed complaining about crashes with my v2 patch). I didn't test this 1/7 patch in isolation but should have -- when 2/7 is applied the problem goes away. v3 of these first 2 patches will be inbound shortly. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
