diff options
| author |   Matthew R. Ochs <mrochs@linux.vnet.ibm.com> | 2017-04-12 14:15:02 -0500 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2017-04-13 22:55:41 -0400 |
| commit | 50b787f7235efbd074bbdf4315e0cc261d85b4d7 (patch) | |
| tree | c2df9481419a8efbc021a1e61352e3e9b893f1df /drivers | |
| parent | scsi: cxlflash: Fence EEH during probe (diff) | |
| download | linux-dev-50b787f7235efbd074bbdf4315e0cc261d85b4d7.tar.xz linux-dev-50b787f7235efbd074bbdf4315e0cc261d85b4d7.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/cxlflash/main.c | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c index ebba3c90a242..3c4a83307e6e 100644 --- a/drivers/scsi/cxlflash/main.c +++ b/drivers/scsi/cxlflash/main.c @@ -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; } |