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    Subject[PATCH 5.18 0097/1095] scsi: qla2xxx: Zero undefined mailbox IN registers
    Date
    From: Bikash Hazarika <bhazarika@marvell.com>

    commit 6c96a3c7d49593ef15805f5e497601c87695abc9 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    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
    @@ -238,6 +238,8 @@ 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;

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