scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case
As Christoph Hellwig noted, SCSI commands that transfer data always have a SG entry. The patch removes dead code in mvumi_make_sgl(), mvumi_complete_cmd() and mvumi_timed_out() that handle zero scsi_sg_count(scmd) case. Also the patch adds pci_unmap_sg() on failure path in mvumi_make_sgl(). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -210,14 +210,15 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct scsi_cmnd *scmd,
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unsigned int sgnum = scsi_sg_count(scmd);
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dma_addr_t busaddr;
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if (sgnum) {
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sg = scsi_sglist(scmd);
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*sg_count = pci_map_sg(mhba->pdev, sg, sgnum,
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(int) scmd->sc_data_direction);
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if (*sg_count > mhba->max_sge) {
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dev_err(&mhba->pdev->dev, "sg count[0x%x] is bigger "
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"than max sg[0x%x].\n",
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dev_err(&mhba->pdev->dev,
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"sg count[0x%x] is bigger than max sg[0x%x].\n",
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*sg_count, mhba->max_sge);
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pci_unmap_sg(mhba->pdev, sg, sgnum,
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(int) scmd->sc_data_direction);
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return -1;
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}
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for (i = 0; i < *sg_count; i++) {
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@ -231,19 +232,6 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct scsi_cmnd *scmd,
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sgd_inc(mhba, m_sg);
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}
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} else {
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scmd->SCp.dma_handle = scsi_bufflen(scmd) ?
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pci_map_single(mhba->pdev, scsi_sglist(scmd),
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scsi_bufflen(scmd),
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(int) scmd->sc_data_direction)
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: 0;
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busaddr = scmd->SCp.dma_handle;
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m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
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m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
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m_sg->flags = 1U << mhba->eot_flag;
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sgd_setsz(mhba, m_sg, cpu_to_le32(scsi_bufflen(scmd)));
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*sg_count = 1;
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}
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return 0;
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}
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@ -1350,21 +1338,10 @@ static void mvumi_complete_cmd(struct mvumi_hba *mhba, struct mvumi_cmd *cmd,
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break;
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}
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if (scsi_bufflen(scmd)) {
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if (scsi_sg_count(scmd)) {
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pci_unmap_sg(mhba->pdev,
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scsi_sglist(scmd),
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if (scsi_bufflen(scmd))
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pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
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scsi_sg_count(scmd),
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(int) scmd->sc_data_direction);
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} else {
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pci_unmap_single(mhba->pdev,
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scmd->SCp.dma_handle,
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scsi_bufflen(scmd),
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(int) scmd->sc_data_direction);
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scmd->SCp.dma_handle = 0;
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}
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}
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cmd->scmd->scsi_done(scmd);
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mvumi_return_cmd(mhba, cmd);
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}
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@ -2171,19 +2148,9 @@ static enum blk_eh_timer_return mvumi_timed_out(struct scsi_cmnd *scmd)
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scmd->result = (DRIVER_INVALID << 24) | (DID_ABORT << 16);
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scmd->SCp.ptr = NULL;
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if (scsi_bufflen(scmd)) {
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if (scsi_sg_count(scmd)) {
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pci_unmap_sg(mhba->pdev,
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scsi_sglist(scmd),
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pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
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scsi_sg_count(scmd),
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(int)scmd->sc_data_direction);
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} else {
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pci_unmap_single(mhba->pdev,
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scmd->SCp.dma_handle,
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scsi_bufflen(scmd),
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(int)scmd->sc_data_direction);
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scmd->SCp.dma_handle = 0;
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}
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}
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mvumi_return_cmd(mhba, cmd);
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spin_unlock_irqrestore(mhba->shost->host_lock, flags);
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