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[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>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-03-08 15:34:20 -08:00 committed by Eric Van Hensbergen
parent 42869c8ada
commit 53bda3e5b4
1 changed files with 3 additions and 4 deletions
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7
net/9p/trans_virtio.c
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@ -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);