tree 90e4768d9d984d94cb45464b49b9c62b93ffba9f
parent 4eabc941259f9d8c8fb71746d3f30c87e1d9e49b
author Shaohua Li <shaohua.li@intel.com> 1324040663 +0100
committer Jens Axboe <axboe@kernel.dk> 1324040663 +0100

block, cfq: fix empty queue crash caused by request merge

All requests of a queue could be merged to other requests of other queue.
Such queue will not have request in it, but it's in service tree. This
will cause kernel oops.
I encounter a BUG_ON() in cfq_dispatch_request() with next patch, but the
issue should exist without the patch.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>