scsi: qla2xxx: Fix DMA-API call trace on NVMe LS requests

commit c75e6aef5039830cce5d4cf764dd204522f89e6b upstream.

The following message and call trace was seen with debug kernels:

DMA-API: qla2xxx 0000:41:00.0: device driver failed to check map
error [device address=0x00000002a3ff38d8] [size=1024 bytes] [mapped as
single]
WARNING: CPU: 0 PID: 2930 at kernel/dma/debug.c:1017
	 check_unmap+0xf42/0x1990

Call Trace:
	debug_dma_unmap_page+0xc9/0x100
	qla_nvme_ls_unmap+0x141/0x210 [qla2xxx]

Remove DMA mapping from the driver altogether, as it is already done by FC
layer. This prevents the warning.

Fixes: c85ab7d9e27a ("scsi: qla2xxx: Fix missed DMA unmap for NVMe ls requests")
Cc: stable@vger.kernel.org
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 582d88d..c57e02a 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -170,18 +170,6 @@ out:
        qla2xxx_rel_qpair_sp(sp->qpair, sp);
 }
 
-static void qla_nvme_ls_unmap(struct srb *sp, struct nvmefc_ls_req *fd)
-{
-       if (sp->flags & SRB_DMA_VALID) {
-               struct srb_iocb *nvme = &sp->u.iocb_cmd;
-               struct qla_hw_data *ha = sp->fcport->vha->hw;
-
-               dma_unmap_single(&ha->pdev->dev, nvme->u.nvme.cmd_dma,
-                                fd->rqstlen, DMA_TO_DEVICE);
-               sp->flags &= ~SRB_DMA_VALID;
-       }
-}
-
 static void qla_nvme_release_ls_cmd_kref(struct kref *kref)
 {
        struct srb *sp = container_of(kref, struct srb, cmd_kref);
@@ -199,7 +187,6 @@ static void qla_nvme_release_ls_cmd_kref(struct kref *kref)
 
        fd = priv->fd;
 
-       qla_nvme_ls_unmap(sp, fd);
        fd->done(fd, priv->comp_status);
 out:
        qla2x00_rel_sp(sp);
@@ -365,13 +352,10 @@ static int qla_nvme_ls_req(struct nvme_fc_local_port *lport,
        nvme->u.nvme.rsp_len = fd->rsplen;
        nvme->u.nvme.rsp_dma = fd->rspdma;
        nvme->u.nvme.timeout_sec = fd->timeout;
-       nvme->u.nvme.cmd_dma = dma_map_single(&ha->pdev->dev, fd->rqstaddr,
-           fd->rqstlen, DMA_TO_DEVICE);
+       nvme->u.nvme.cmd_dma = fd->rqstdma;
        dma_sync_single_for_device(&ha->pdev->dev, nvme->u.nvme.cmd_dma,
            fd->rqstlen, DMA_TO_DEVICE);
 
-       sp->flags |= SRB_DMA_VALID;
-
        rval = qla2x00_start_sp(sp);
        if (rval != QLA_SUCCESS) {
                ql_log(ql_log_warn, vha, 0x700e,
@@ -379,7 +363,6 @@ static int qla_nvme_ls_req(struct nvme_fc_local_port *lport,
                wake_up(&sp->nvme_ls_waitq);
                sp->priv = NULL;
                priv->sp = NULL;
-               qla_nvme_ls_unmap(sp, fd);
                qla2x00_rel_sp(sp);
                return rval;
        }