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    Subject[patch 11/33] Fix qlogicpti DMA unmapping
    -stable review patch.  If anyone has any objections, please let us know.

    ------------------
    From: David Miller <davem@davemloft.net>

    [SCSI] QLOGICPTI: Do not unmap DMA unless we actually mapped something.

    We only map DMA when cmd->request_bufflen is non-zero for non-sg
    buffers, we thus should make the same check when unmapping.

    Based upon a report from Pasi Pirhonen.

    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/scsi/qlogicpti.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/scsi/qlogicpti.c
    +++ b/drivers/scsi/qlogicpti.c
    @@ -1281,7 +1281,7 @@ static struct scsi_cmnd *qlogicpti_intr_
    (struct scatterlist *)Cmnd->request_buffer,
    Cmnd->use_sg,
    Cmnd->sc_data_direction);
    - } else {
    + } else if (Cmnd->request_bufflen) {
    sbus_unmap_single(qpti->sdev,
    (__u32)((unsigned long)Cmnd->SCp.ptr),
    Cmnd->request_bufflen,
    --
    -
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