[PATCH 5.4 251/389] scsi: qla2xxx: Fix erroneous mailbox timeout after PCI error injection

[Greg Kroah-Hartman]

From: Quinn Tran <qutran@xxxxxxxxxxx>

commit f260694e6463b63ae550aad25ddefe94cb1904da upstream.

Clear wait for mailbox interrupt flag to prevent stale mailbox:

Feb 22 05:22:56 ltcden4-lp7 kernel: qla2xxx [0135:90:00.1]-500a:4: LOOP UP detected (16 Gbps).
Feb 22 05:22:59 ltcden4-lp7 kernel: qla2xxx [0135:90:00.1]-d04c:4: MBX Command timeout for cmd 69, ...

To fix the issue, driver needs to clear the MBX_INTR_WAIT flag on purging
the mailbox. When the stale mailbox completion does arrive, it will be
dropped.

Link: https://lore.kernel.org/r/20220616053508.27186-11-njavali@xxxxxxxxxxx
Fixes: b6faaaf796d7 ("scsi: qla2xxx: Serialize mailbox request")
Cc: Naresh Bannoth <nbannoth@xxxxxxxxxx>
Cc: Kyle Mahlkuch <Kyle.Mahlkuch@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Naresh Bannoth <nbannoth@xxxxxxxxxx>
Tested-by: Naresh Bannoth <nbannoth@xxxxxxxxxx>
Signed-off-by: Quinn Tran <qutran@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/qla2xxx/qla_mbx.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -271,6 +271,12 @@ qla2x00_mailbox_command(scsi_qla_host_t
 		atomic_inc(&ha->num_pend_mbx_stage3);
 		if (!wait_for_completion_timeout(&ha->mbx_intr_comp,
 		    mcp->tov * HZ)) {
+			ql_dbg(ql_dbg_mbx, vha, 0x117a,
+			    "cmd=%x Timeout.\n", command);
+			spin_lock_irqsave(&ha->hardware_lock, flags);
+			clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
+			spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
 			if (chip_reset != ha->chip_reset) {
 				spin_lock_irqsave(&ha->hardware_lock, flags);
 				ha->flags.mbox_busy = 0;
@@ -281,12 +287,6 @@ qla2x00_mailbox_command(scsi_qla_host_t
 				rval = QLA_ABORTED;
 				goto premature_exit;
 			}
-			ql_dbg(ql_dbg_mbx, vha, 0x117a,
-			    "cmd=%x Timeout.\n", command);
-			spin_lock_irqsave(&ha->hardware_lock, flags);
-			clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
-			spin_unlock_irqrestore(&ha->hardware_lock, flags);
-
 		} else if (ha->flags.purge_mbox ||
 		    chip_reset != ha->chip_reset) {
 			spin_lock_irqsave(&ha->hardware_lock, flags);