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>
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);