From 35a03164c1b4d138e55898853212bded14cf4ec7 Mon Sep 17 00:00:00 2001
From: Dor Laor <dor.laor@xxxxxxxxxxxx>
Date: Mon, 17 Dec 2007 01:43:28 +0200
Subject: [PATCH] Check for device status on tx.
Allow tx only if VIRTIO_CONFIG_S_DRIVER_OK.
It can prevent an smp race of tx and driver unload.
Signed-off-by: Dor Laor <dor.laor@xxxxxxxxxxxx>
---
qemu/hw/virtio-net.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/qemu/hw/virtio-net.c b/qemu/hw/virtio-net.c
index 3320dd8..f6f1f28 100644
--- a/qemu/hw/virtio-net.c
+++ b/qemu/hw/virtio-net.c
@@ -140,6 +140,9 @@ static void virtio_net_handle_tx(VirtIODevice *vdev,
VirtQueue *vq)
VirtIONet *n = to_virtio_net(vdev);
VirtQueueElement elem;
+ if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ return;
+
while (virtqueue_pop(vq, &elem)) {
int i;
size_t len = 0;
--
1.5.3.3
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