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authorRusty Russell <rusty@rustcorp.com.au>2008-04-07 14:30:28 +1000
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-07 13:14:22 -0700
commit2557a933b795c1988c721ebb871cd735128bb9cb (patch)
tree96581bd5acac44bbe0399aa445197509d9ae60ff /drivers
parent4cac04dd63fa3b202ee313ed1afbbd135ab887ee (diff)
downloadop-kernel-dev-2557a933b795c1988c721ebb871cd735128bb9cb.zip
op-kernel-dev-2557a933b795c1988c721ebb871cd735128bb9cb.tar.gz
virtio: remove overzealous BUG_ON.
The 'disable_cb' callback is designed as an optimization to tell the host we don't need callbacks now. As it is not reliable, the debug check is overzealous: it can happen on two CPUs at the same time. Document this. Even if it were reliable, the virtio_net driver doesn't disable callbacks on transmit so the START_USE/END_USE debugging reentrance protection can be easily tripped even on UP. Thanks to Balaji Rao for the bug report and testing. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> CC: Balaji Rao <balajirrao@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/virtio/virtio_ring.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index aa71402..c2fa5c6 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -214,10 +214,7 @@ static void vring_disable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- START_USE(vq);
- BUG_ON(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
- END_USE(vq);
}
static bool vring_enable_cb(struct virtqueue *_vq)
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