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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>
This commit is contained in:
Alexey Khoroshilov 2017-04-24 02:01:00 +03:00 committed by Martin K. Petersen
parent 6b8accea1b
commit 4bd13a0771
1 changed files with 26 additions and 59 deletions
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85
drivers/scsi/mvumi.c
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@ -210,39 +210,27 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct scsi_cmnd *scmd,
unsigned int sgnum = scsi_sg_count(scmd);
dma_addr_t busaddr;
if (sgnum) {
sg = scsi_sglist(scmd);
*sg_count = pci_map_sg(mhba->pdev, sg, sgnum,
(int) scmd->sc_data_direction);
if (*sg_count > mhba->max_sge) {
dev_err(&mhba->pdev->dev, "sg count[0x%x] is bigger "
"than max sg[0x%x].\n",
*sg_count, mhba->max_sge);
return -1;
}
for (i = 0; i < *sg_count; i++) {
busaddr = sg_dma_address(&sg[i]);
m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
m_sg->flags = 0;
sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(&sg[i])));
if ((i + 1) == *sg_count)
m_sg->flags |= 1U << mhba->eot_flag;
sgd_inc(mhba, m_sg);
}
} else {
scmd->SCp.dma_handle = scsi_bufflen(scmd) ?
pci_map_single(mhba->pdev, scsi_sglist(scmd),
scsi_bufflen(scmd),
(int) scmd->sc_data_direction)
: 0;
busaddr = scmd->SCp.dma_handle;
sg = scsi_sglist(scmd);
*sg_count = pci_map_sg(mhba->pdev, sg, sgnum,
(int) scmd->sc_data_direction);
if (*sg_count > mhba->max_sge) {
dev_err(&mhba->pdev->dev,
"sg count[0x%x] is bigger than max sg[0x%x].\n",
*sg_count, mhba->max_sge);
pci_unmap_sg(mhba->pdev, sg, sgnum,
(int) scmd->sc_data_direction);
return -1;
}
for (i = 0; i < *sg_count; i++) {
busaddr = sg_dma_address(&sg[i]);
m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
m_sg->flags = 1U << mhba->eot_flag;
sgd_setsz(mhba, m_sg, cpu_to_le32(scsi_bufflen(scmd)));
*sg_count = 1;
m_sg->flags = 0;
sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(&sg[i])));
if ((i + 1) == *sg_count)
m_sg->flags |= 1U << mhba->eot_flag;
sgd_inc(mhba, m_sg);
}
return 0;
@ -1350,21 +1338,10 @@ static void mvumi_complete_cmd(struct mvumi_hba *mhba, struct mvumi_cmd *cmd,
break;
}
if (scsi_bufflen(scmd)) {
if (scsi_sg_count(scmd)) {
pci_unmap_sg(mhba->pdev,
scsi_sglist(scmd),
scsi_sg_count(scmd),
(int) scmd->sc_data_direction);
} else {
pci_unmap_single(mhba->pdev,
scmd->SCp.dma_handle,
scsi_bufflen(scmd),
(int) scmd->sc_data_direction);
scmd->SCp.dma_handle = 0;
}
}
if (scsi_bufflen(scmd))
pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
scsi_sg_count(scmd),
(int) scmd->sc_data_direction);
cmd->scmd->scsi_done(scmd);
mvumi_return_cmd(mhba, cmd);
}
@ -2171,19 +2148,9 @@ static enum blk_eh_timer_return mvumi_timed_out(struct scsi_cmnd *scmd)
scmd->result = (DRIVER_INVALID << 24) | (DID_ABORT << 16);
scmd->SCp.ptr = NULL;
if (scsi_bufflen(scmd)) {
if (scsi_sg_count(scmd)) {
pci_unmap_sg(mhba->pdev,
scsi_sglist(scmd),
scsi_sg_count(scmd),
(int)scmd->sc_data_direction);
} else {
pci_unmap_single(mhba->pdev,
scmd->SCp.dma_handle,
scsi_bufflen(scmd),
(int)scmd->sc_data_direction);
scmd->SCp.dma_handle = 0;
}
pci_unmap_sg(mhba->pdev, scsi_sglist(scmd),
scsi_sg_count(scmd),
(int)scmd->sc_data_direction);
}
mvumi_return_cmd(mhba, cmd);
spin_unlock_irqrestore(mhba->shost->host_lock, flags);