The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 6c96a3c7d49593ef15805f5e497601c87695abc9 Mon Sep 17 00:00:00 2001 From: Bikash Hazarika <bhazarika@xxxxxxxxxxx> Date: Tue, 12 Jul 2022 22:20:38 -0700 Subject: [PATCH] scsi: qla2xxx: Zero undefined mailbox IN registers 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@xxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx> Signed-off-by: Bikash Hazarika <bhazarika@xxxxxxxxxxx> Signed-off-by: Quinn Tran <qutran@xxxxxxxxxxx> Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c index 643fa0052f5a..9a3f832c49ef 100644 --- a/drivers/scsi/qla2xxx/qla_mbx.c +++ b/drivers/scsi/qla2xxx/qla_mbx.c @@ -238,6 +238,8 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp) 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;
