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Commit 53bda3e5 authored by Venkateswararao Jujjuri (JV)'s avatar Venkateswararao Jujjuri (JV) Committed by Eric Van Hensbergen
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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: default avatarVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 42869c8a

net/9p/trans_virtio.c

+3 −4
Original line number Original line Diff line number Diff line
@@ -146,11 +146,10 @@ static void req_done(struct virtqueue *vq) 
		rc = virtqueue_get_buf(chan->vq, &len);

		rc = virtqueue_get_buf(chan->vq, &len);





		if (rc != NULL) {

		if (rc != NULL) {

			if (!chan->ring_bufs_avail) {

			chan->ring_bufs_avail = 1;

			chan->ring_bufs_avail = 1;

				wake_up(chan->vc_wq);

			}

			spin_unlock_irqrestore(&chan->lock, flags);

			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, ": rc %p\n", rc);

			P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n",

			P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n",

					rc->tag);

					rc->tag);