[net/9p] unconditional wake_up to proc waiting for space on VirtIO ring

Process may wait to get space on VirtIO ring to send a transaction to
VirtFS server. Current code just does a conditional wake_up() which
means only one process will be woken up even if multiple processes
are waiting.

This fix makes the wake_up unconditional. Hence we won't have any
processes waiting for-ever.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 9b550ed9c71..961e025957a 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -146,11 +146,10 @@ static void req_done(struct virtqueue *vq)
                 rc = virtqueue_get_buf(chan->vq, &len);
 
                 if (rc != NULL) {
-                        if (!chan->ring_bufs_avail) {
-                                chan->ring_bufs_avail = 1;
-                                wake_up(chan->vc_wq);
-                        }
+                        chan->ring_bufs_avail = 1;
                         spin_unlock_irqrestore(&chan->lock, flags);
+                        /* Wakeup if anyone waiting for VirtIO ring space. */
+                        wake_up(chan->vc_wq);
                         P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc);
                         P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n",
                                         rc->tag);