Messages in this thread | | | Date | Tue, 02 Sep 2014 10:24:40 -0600 | From | Jens Axboe <> | Subject | Re: [PATCH] blk-merge: fix blk_recount_segments |
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On 09/02/2014 09:02 AM, Ming Lei wrote: > QUEUE_FLAG_NO_SG_MERGE is set at default for blk-mq devices, > so bio->bi_phys_segment computed may be bigger than > queue_max_segments(q) for blk-mq devices, then drivers will > fail to handle the case, for example, BUG_ON() in > virtio_queue_rq() can be triggerd for virtio-blk: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1359146 > > This patch fixes the issue by ignoring the QUEUE_FLAG_NO_SG_MERGE > flag if the computed bio->bi_phys_segment is bigger than > queue_max_segments(q), and the regression is caused by commit > 05f1dd53152173(block: add queue flag for disabling SG merging). > > Reported-by: Kick In <pierre-andre.morey@canonical.com> > Tested-by: Chris J Arges <chris.j.arges@canonical.com> > Signed-off-by: Ming Lei <ming.lei@canonical.com>
Thanks Ming, this looks nice and clean. Will apply for 3.17.
-- Jens Axboe
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