[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>
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@ -1281,7 +1281,7 @@ static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
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(struct scatterlist *)Cmnd->request_buffer,
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(struct scatterlist *)Cmnd->request_buffer,
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Cmnd->use_sg,
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Cmnd->use_sg,
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Cmnd->sc_data_direction);
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Cmnd->sc_data_direction);
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} else {
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} else if (Cmnd->request_bufflen) {
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sbus_unmap_single(qpti->sdev,
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sbus_unmap_single(qpti->sdev,
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(__u32)((unsigned long)Cmnd->SCp.ptr),
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(__u32)((unsigned long)Cmnd->SCp.ptr),
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Cmnd->request_bufflen,
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Cmnd->request_bufflen,
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