[67/87] [SCSI] scsi_dh_alua: fix deadlock in stpg_endio

From: Greg KH
Date: Mon Mar 21 2011 - 19:38:08 EST

2.6.37-stable review patch. If anyone has any objections, please let us know.


From: Joseph Gruher <joseph.r.gruher@xxxxxxxxx>

commit ed0f36bc5719b25659b637f80ceea85494b84502 upstream.

The use of blk_execute_rq_nowait() implies __blk_put_request() is needed
in stpg_endio() rather than blk_put_request() -- blk_finish_request() is
called with queue lock already held.

Signed-off-by: Joseph Gruher <joseph.r.gruher@xxxxxxxxx>
Signed-off-by: Ilgu Hong <ilgu.hong@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

drivers/scsi/device_handler/scsi_dh_alua.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -285,7 +285,8 @@ static void stpg_endio(struct request *r
- blk_put_request(req);
+ req->end_io_data = NULL;
+ __blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;

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