From 53bda3e5b4e91763224ecb7d05dab94d281fd41d Mon Sep 17 00:00:00 2001 From: "Venkateswararao Jujjuri (JV)" Date: Tue, 8 Mar 2011 15:34:20 -0800 Subject: [PATCH] [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 Signed-off-by: Eric Van Hensbergen --- net/9p/trans_virtio.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 9b550ed9c711..961e025957ae 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); -- GitLab