[PATCH 03/17] mpi3mr: Fix I/O block counter leak on admin request post failure

[Chandrakanth Patil <chandrakanth.patil@broadcom.com>]

The per device I/O block counter is raised before a task management
request is posted and only lowered once the request completes. If the
post itself fails the counter stays raised and I/O to that device
remains blocked.

Lower it on the failure path as well.

Fixes: 506bc1a0d6ba ("scsi: mpi3mr: Add support for MPT commands")
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
---
 drivers/scsi/mpi3mr/mpi3mr_app.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 1cd1c38dcd56..a4fe10a05cb3 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -2782,6 +2782,8 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		dprint_bsg_err(mrioc,
 		    "%s: posting bsg request is failed\n", __func__);
 		rval = -EAGAIN;
+		if (block_io && stgt_priv)
+			atomic_dec(&stgt_priv->block_io);
 		goto out_unlock;
 	}
 	wait_for_completion_timeout(&mrioc->bsg_cmds.done,