9p/trans_virtio: don't bother with p9_tag_lookup()

Just store the pointer to req instead of that to req->tc as opaque
data.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6e70ddb..9fc6a56 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -143,7 +143,6 @@
 static void req_done(struct virtqueue *vq)
 {
 	struct virtio_chan *chan = vq->vdev->priv;
-	struct p9_fcall *rc;
 	unsigned int len;
 	struct p9_req_t *req;
 	unsigned long flags;
@@ -152,8 +151,8 @@
 
 	while (1) {
 		spin_lock_irqsave(&chan->lock, flags);
-		rc = virtqueue_get_buf(chan->vq, &len);
-		if (rc == NULL) {
+		req = virtqueue_get_buf(chan->vq, &len);
+		if (req == NULL) {
 			spin_unlock_irqrestore(&chan->lock, flags);
 			break;
 		}
@@ -161,9 +160,6 @@
 		spin_unlock_irqrestore(&chan->lock, flags);
 		/* Wakeup if anyone waiting for VirtIO ring space. */
 		wake_up(chan->vc_wq);
-		p9_debug(P9_DEBUG_TRANS, ": rc %p\n", rc);
-		p9_debug(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag);
-		req = p9_tag_lookup(chan->client, rc->tag);
 		p9_client_cb(chan->client, req, REQ_STATUS_RCVD);
 	}
 }
@@ -284,7 +280,7 @@
 	if (in)
 		sgs[out_sgs + in_sgs++] = chan->sg + out;
 
-	err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req->tc,
+	err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req,
 				GFP_ATOMIC);
 	if (err < 0) {
 		if (err == -ENOSPC) {
@@ -469,7 +465,7 @@
 	}
 
 	BUG_ON(out_sgs + in_sgs > ARRAY_SIZE(sgs));
-	err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req->tc,
+	err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req,
 				GFP_ATOMIC);
 	if (err < 0) {
 		if (err == -ENOSPC) {