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authorJens Axboe <axboe@kernel.dk>2021-11-01 15:56:09 +0300
committerJens Axboe <axboe@kernel.dk>2021-11-02 15:57:20 +0300
commita22c00be90de188d36f4772ef7b268aa48d7010d (patch)
treed3365e21de21addda6532956d4590c8816a3df1b /block
parentef1661ba6d2e9c8eecd13ee04067bdcc59f7aac6 (diff)
downloadlinux-a22c00be90de188d36f4772ef7b268aa48d7010d.tar.xz
block: assign correct tag before doing prefetch of request
Ensure that current tag is correctly assigned before attempting to prefetch the first cacheline of the request. Fixes: 92aff191cc5b ("block: prefetch request to be initialized") Reported-and-tested-by: syzbot+cd20829ac44b92bf6ed0@syzkaller.appspotmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 221d1b7d10d6..4787d5b74aa3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -405,8 +405,8 @@ __blk_mq_alloc_requests_batch(struct blk_mq_alloc_data *data,
for (i = 0; tag_mask; i++) {
if (!(tag_mask & (1UL << i)))
continue;
- prefetch(tags->static_rqs[tag]);
tag = tag_offset + i;
+ prefetch(tags->static_rqs[tag]);
tag_mask &= ~(1UL << i);
rq = blk_mq_rq_ctx_init(data, tags, tag, alloc_time_ns);
rq_list_add(data->cached_rq, rq);