4.2.8-ckt7 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: "Bryn M. Reeves" <bmr@xxxxxxxxxx>
commit 98dbc9c6c61698792e3a66f32f3bf066201d42d7 upstream.
An "old" (.request_fn) DM 'struct request' stores a pointer to the
associated 'struct dm_rq_target_io' in rq->special.
dm_requeue_original_request(), previously named
dm_requeue_unmapped_original_request(), called dm_unprep_request() to
reset rq->special to NULL. But rq_end_stats() would go on to hit a NULL
pointer deference because its call to tio_from_request() returned NULL.
Fix this by calling rq_end_stats() _before_ dm_unprep_request()
Signed-off-by: Bryn M. Reeves <bmr@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Fixes: e262f34741 ("dm stats: add support for request-based DM devices")
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/md/dm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 3f82998..e066983 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1184,9 +1184,9 @@ static void dm_requeue_original_request(struct mapped_device *md,
{
int rw = rq_data_dir(rq);
+ rq_end_stats(md, rq);
dm_unprep_request(rq);
- rq_end_stats(md, rq);
if (!rq->q->mq_ops)
old_requeue_request(rq);
else {
--
2.7.4
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