drm/virtio: remove incorrect ENOSPC check

The handling of virtqueue_add_sgs ENOSPC error is incorrect because
it can result in out-of-order virtqueue_add_sgs and break fences.
We never get ENOSPC anyway because the caller waits until there is
enough space (the other caller that did not wait was removed in
commit 32d6c2c5 ("drm/virtio: Rewrite virtio_gpu_queue_ctrl_buffer
using fenced version.")).  Remove the incorrect and unnecessary error
path.

This also adds a WARN_ON(ret) until we properly handle errors.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Cc: David Riley <davidriley@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200205181955.202485-3-olvaffe@gmail.comSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_vq.c

@@ -310,8 +310,6 @@ static struct sg_table *vmalloc_to_sgt(char *data, uint32_t size, int *sg_ents)
 static bool virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
 						struct virtio_gpu_vbuffer *vbuf,
 						struct scatterlist *vout)
-		__releases(&vgdev->ctrlq.qlock)
-		__acquires(&vgdev->ctrlq.qlock)
 {
 	struct virtqueue *vq = vgdev->ctrlq.vq;
 	struct scatterlist *sgs[3], vcmd, vresp;
@@ -337,19 +335,14 @@ static bool virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
 		incnt++;
 	}
 
-retry:
 	ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
-	if (ret == -ENOSPC) {
-		spin_unlock(&vgdev->ctrlq.qlock);
-		wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= outcnt + incnt);
-		spin_lock(&vgdev->ctrlq.qlock);
-		goto retry;
-	} else {
-		trace_virtio_gpu_cmd_queue(vq,
-			(struct virtio_gpu_ctrl_hdr *)vbuf->buf);
+	WARN_ON(ret);
+
+	trace_virtio_gpu_cmd_queue(vq,
+		(struct virtio_gpu_ctrl_hdr *)vbuf->buf);
+
+	notify = virtqueue_kick_prepare(vq);
 
-		notify = virtqueue_kick_prepare(vq);
-	}
 	return notify;
 }