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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-03-08 15:34:20 -0800
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-22 16:32:19 -0500
commit53bda3e5b4e91763224ecb7d05dab94d281fd41d (patch)
tree0e21d7fd11ff058a9deb37dee53eac68ad42f727 /net/9p
parent42869c8adae72366fc6c4f3924ce3d6c3735c4a3 (diff)
downloadop-kernel-dev-53bda3e5b4e91763224ecb7d05dab94d281fd41d.zip
op-kernel-dev-53bda3e5b4e91763224ecb7d05dab94d281fd41d.tar.gz
[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>
Diffstat (limited to 'net/9p')
-rw-r--r--net/9p/trans_virtio.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 9b550ed..961e025 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);
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