[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>

parent d791d413

drivers/scsi/qlogicpti.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1281,7 +1281,7 @@ static struct scsi_cmnd qlogicpti_intr_handler(struct qlogicpti qpti)
		(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,