virtio-scsi: push vq lock/unlock into virtscsi_vq_done

Avoid duplicated code in all of the callers.

Cc: linux-scsi@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Asias He <asias@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/scsi/virtio_scsi.c

@@ -165,28 +165,30 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
 	sc->scsi_done(sc);
 }
 
-static void virtscsi_vq_done(struct virtio_scsi *vscsi, struct virtqueue *vq,
+static void virtscsi_vq_done(struct virtio_scsi *vscsi,
+			     struct virtio_scsi_vq *virtscsi_vq,
 			     void (*fn)(struct virtio_scsi *vscsi, void *buf))
 {
 	void *buf;
 	unsigned int len;
+	unsigned long flags;
+	struct virtqueue *vq = virtscsi_vq->vq;
 
+	spin_lock_irqsave(&virtscsi_vq->vq_lock, flags);
 	do {
 		virtqueue_disable_cb(vq);
 		while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
 			fn(vscsi, buf);
 	} while (!virtqueue_enable_cb(vq));
+	spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags);
 }
 
 static void virtscsi_req_done(struct virtqueue *vq)
 {
 	struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
 	struct virtio_scsi *vscsi = shost_priv(sh);
-	unsigned long flags;
 
-	spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags);
-	virtscsi_vq_done(vscsi, vq, virtscsi_complete_cmd);
-	spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags);
+	virtscsi_vq_done(vscsi, &vscsi->req_vq, virtscsi_complete_cmd);
 };
 
 static void virtscsi_complete_free(struct virtio_scsi *vscsi, void *buf)
@@ -203,11 +205,8 @@ static void virtscsi_ctrl_done(struct virtqueue *vq)
 {
 	struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
 	struct virtio_scsi *vscsi = shost_priv(sh);
-	unsigned long flags;
 
-	spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags);
-	virtscsi_vq_done(vscsi, vq, virtscsi_complete_free);
-	spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags);
+	virtscsi_vq_done(vscsi, &vscsi->ctrl_vq, virtscsi_complete_free);
 };
 
 static int virtscsi_kick_event(struct virtio_scsi *vscsi,
@@ -342,11 +341,8 @@ static void virtscsi_event_done(struct virtqueue *vq)
 {
 	struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
 	struct virtio_scsi *vscsi = shost_priv(sh);
-	unsigned long flags;
 
-	spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
-	virtscsi_vq_done(vscsi, vq, virtscsi_complete_event);
-	spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
+	virtscsi_vq_done(vscsi, &vscsi->event_vq, virtscsi_complete_event);
 };
 
 /**