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scsi: cxlflash: Remove unnecessary DMA mapping 

Devices supported by the cxlflash driver are fully coherent and do not require
a bus address mapping. Avoid unnecessary path length by using the virtual
address and length already present in the scatter-gather entry.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs 2017-04-12 14:15:02 -05:00 committed by Martin K. Petersen
parent 323e33428e
commit 50b787f723
1 changed files with 2 additions and 13 deletions
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15
drivers/scsi/cxlflash/main.c
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@ -176,7 +176,6 @@ static void cmd_complete(struct afu_cmd *cmd)
dev_dbg_ratelimited(dev, "%s:scp=%p result=%08x ioasc=%08x\n",
__func__, scp, scp->result, cmd->sa.ioasc);
scsi_dma_unmap(scp);
scp->scsi_done(scp);
if (cmd_is_tmf) {
@ -445,7 +444,6 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
struct scatterlist *sg = scsi_sglist(scp);
u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN;
ulong lock_flags;
int nseg = 0;
int rc = 0;
dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu "
@ -487,15 +485,8 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
}
if (likely(sg)) {
nseg = scsi_dma_map(scp);
if (unlikely(nseg < 0)) {
dev_err(dev, "%s: Fail DMA map\n", __func__);
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;
}
cmd->rcb.data_len = sg_dma_len(sg);
cmd->rcb.data_ea = sg_dma_address(sg);
cmd->rcb.data_len = sg->length;
cmd->rcb.data_ea = (uintptr_t)sg_virt(sg);
}
cmd->scp = scp;
@ -513,8 +504,6 @@ static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp)
memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb));
rc = afu->send_cmd(afu, cmd);
if (unlikely(rc))
scsi_dma_unmap(scp);
out:
return rc;
}