From: Bikash Hazarika <bhazarika@marvell.com>

Date: Tue, 12 Jul 2022 22:20:38 -0700

Subject: scsi: qla2xxx: Zero undefined mailbox IN registers

Patch-mainline: v5.20-rc1

Git-commit: 6c96a3c7d49593ef15805f5e497601c87695abc9

References: bsc#1201651

While requesting a new mailbox command, driver does not write any data to

unused registers.  Initialize the unused register value to zero while

requesting a new mailbox command to prevent stale entry access by firmware.

Link: https://lore.kernel.org/r/20220713052045.10683-4-njavali@marvell.com

Cc: stable@vger.kernel.org

Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>

Signed-off-by: Bikash Hazarika <bhazarika@marvell.com>

Signed-off-by: Quinn Tran <qutran@marvell.com>

Signed-off-by: Nilesh Javali <njavali@marvell.com>

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Acked-by: Daniel Wagner <dwagner@suse.de>

---

 drivers/scsi/qla2xxx/qla_mbx.c |    2 ++

 1 file changed, 2 insertions(+)

--- a/drivers/scsi/qla2xxx/qla_mbx.c

+++ b/drivers/scsi/qla2xxx/qla_mbx.c

@@ -239,6 +239,8 @@ qla2x00_mailbox_command(scsi_qla_host_t

 			ql_dbg(ql_dbg_mbx, vha, 0x1112,

 			    "mbox[%d]<-0x%04x\n", cnt, *iptr);

 			wrt_reg_word(optr, *iptr);

+		} else {

+			wrt_reg_word(optr, 0);

 		}

 		mboxes >>= 1;