[PATCH 06/16] xen-scsifront: add scsi device as argument to scsifront_do_request()

[Hannes Reinecke <hare@suse.de>]

Add scsi device as argument to scsifront_do_request() so that it
will be possible to call it with a NULL command pointer.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/xen-scsifront.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 9ec55ddc1204..a0c13200d53a 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -178,7 +178,8 @@ static void scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id)
 		scsifront_wake_up(info);
 }
 
-static int scsifront_do_request(struct vscsifrnt_info *info,
+static int scsifront_do_request(struct scsi_device *sdev,
+				struct vscsifrnt_info *info,
 				struct vscsifrnt_shadow *shadow)
 {
 	struct vscsiif_front_ring *ring = &(info->ring);
@@ -205,17 +206,25 @@ static int scsifront_do_request(struct vscsifrnt_info *info,
 	ring_req->ref_rqid    = shadow->ref_rqid;
 	ring_req->nr_segments = shadow->nr_segments;
 
-	ring_req->id      = sc->device->id;
-	ring_req->lun     = sc->device->lun;
-	ring_req->channel = sc->device->channel;
-	ring_req->cmd_len = sc->cmd_len;
+	ring_req->id      = sdev->id;
+	ring_req->lun     = sdev->lun;
+	ring_req->channel = sdev->channel;
 
-	BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE);
+	if (sc) {
+		ring_req->cmd_len = sc->cmd_len;
 
-	memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len);
+		BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE);
 
-	ring_req->sc_data_direction   = (uint8_t)sc->sc_data_direction;
-	ring_req->timeout_per_command = scsi_cmd_to_rq(sc)->timeout / HZ;
+		memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len);
+
+		ring_req->sc_data_direction   = (uint8_t)sc->sc_data_direction;
+		ring_req->timeout_per_command =
+			scsi_cmd_to_rq(sc)->timeout / HZ;
+	} else {
+		ring_req->cmd_len = VSCSIIF_MAX_COMMAND_SIZE;
+		memset(ring_req->cmnd, 0, VSCSIIF_MAX_COMMAND_SIZE);
+		ring_req->sc_data_direction = DMA_NONE;
+	}
 
 	for (i = 0; i < (shadow->nr_segments & ~VSCSIIF_SG_GRANT); i++)
 		ring_req->seg[i] = shadow->seg[i];
@@ -637,7 +646,7 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
 		return 0;
 	}
 
-	if (scsifront_do_request(info, shadow)) {
+	if (scsifront_do_request(sc->device, info, shadow)) {
 		scsifront_gnttab_done(info, shadow);
 		goto busy;
 	}
@@ -685,7 +694,7 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
 		if (scsifront_enter(info))
 			goto fail;
 
-		if (!scsifront_do_request(info, shadow))
+		if (!scsifront_do_request(sc->device, info, shadow))
 			break;
 
 		scsifront_return(info);
-- 
2.35.3