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| author | Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com> | 2011-03-08 15:34:20 -0800 |
|---|---|---|
| committer | Eric Van Hensbergen <ericvh@gmail.com> | 2011-03-22 16:32:19 -0500 |
| commit | 53bda3e5b4e91763224ecb7d05dab94d281fd41d (patch) | |
| tree | 0e21d7fd11ff058a9deb37dee53eac68ad42f727 /net/9p/trans_virtio.c | |
| parent | 42869c8adae72366fc6c4f3924ce3d6c3735c4a3 (diff) | |
| download | lwn-53bda3e5b4e91763224ecb7d05dab94d281fd41d.tar.gz lwn-53bda3e5b4e91763224ecb7d05dab94d281fd41d.zip | |
[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/trans_virtio.c')
| -rw-r--r-- | net/9p/trans_virtio.c | 7 |
1 files 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); |