[PATCH 42/47] xen-scsifront: call scsifront_action_handler() with a NULL command argument

[Hannes Reinecke <hare@xxxxxxx>]

For device reset we shouldn't rely on the scsi command, so allow
scsifront_action_handler() to be called with a NULL command argument.

Signed-off-by: Hannes Reinecke <hare@xxxxxxxx>
---
 drivers/scsi/xen-scsifront.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 04af950..b093619 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -582,21 +582,27 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
  * We have to wait until an answer is returned. This answer contains the
  * result to be returned to the requestor.
  */
-static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
+static int scsifront_action_handler(struct scsi_device *sdev,
+				    struct scsi_cmnd *sc)
 {
-	struct Scsi_Host *host = sc->device->host;
+	struct Scsi_Host *host = sdev->host;
 	struct vscsifrnt_info *info = shost_priv(host);
-	struct vscsifrnt_shadow *shadow, *s = scsi_cmd_priv(sc);
+	struct vscsifrnt_shadow *shadow, *s;
 	int err = 0;
 
 	shadow = kzalloc(sizeof(*shadow), GFP_NOIO);
 	if (!shadow)
 		return FAILED;
 
-	shadow->act = act;
 	shadow->rslt_reset = RSLT_RESET_WAITING;
 	shadow->sc = sc;
-	shadow->ref_rqid = s->rqid;
+	if (sc) {
+		s = scsi_cmd_priv(sc);
+		shadow->ref_rqid = s->rqid;
+		shadow->act = VSCSIIF_ACT_SCSI_ABORT;
+	} else
+		shadow->act = VSCSIIF_ACT_SCSI_RESET;
+
 	init_waitqueue_head(&shadow->wq_reset);
 
 	spin_lock_irq(host->host_lock);
@@ -646,13 +652,13 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
 static int scsifront_eh_abort_handler(struct scsi_cmnd *sc)
 {
 	pr_debug("%s\n", __func__);
-	return scsifront_action_handler(sc, VSCSIIF_ACT_SCSI_ABORT);
+	return scsifront_action_handler(sc->device, sc);
 }
 
 static int scsifront_dev_reset_handler(struct scsi_cmnd *sc)
 {
 	pr_debug("%s\n", __func__);
-	return scsifront_action_handler(sc, VSCSIIF_ACT_SCSI_RESET);
+	return scsifront_action_handler(sc->device, NULL);
 }
 
 static int scsifront_sdev_configure(struct scsi_device *sdev)
-- 
1.8.5.6