From: Venkateswararao Jujjuri (JV) Date: Tue, 8 Mar 2011 23:34:20 +0000 (-0800) Subject: [net/9p] unconditional wake_up to proc waiting for space on VirtIO ring X-Git-Tag: MMI-PSA29.97-13-9~20433^2~4 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=53bda3e5b4e91763224ecb7d05dab94d281fd41d;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git [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 --- 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);