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s390/scm_blk: fix endless loop for requests != REQ_TYPE_FS 

The while loop only peeks at the top request in the queue but does
not yet consume it. Since we only handle fs requests, we need to
dequeue and complete all other request command types with error
just in case we would ever receive such an unforeseen request.

Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Steffen Maier 2013-11-05 12:59:46 +01:00 committed by Martin Schwidefsky
parent 106078641f
commit de9587a2f5
1 changed files with 5 additions and 1 deletions
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6
drivers/s390/block/scm_blk.c
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@ -223,8 +223,12 @@ static void scm_blk_request(struct request_queue *rq)
int ret;
while ((req = blk_peek_request(rq))) {
if (req->cmd_type != REQ_TYPE_FS)
if (req->cmd_type != REQ_TYPE_FS) {
blk_start_request(req);
blk_dump_rq_flags(req, KMSG_COMPONENT " bad request");
blk_end_request_all(req, -EIO);
continue;
}
if (!scm_permit_request(bdev, req)) {
scm_ensure_queue_restart(bdev);