[PATCH] virtio-rng: Remove false BUG for spurious callbacks
From: Rusty Russell
Date: Thu Apr 23 2009 - 03:13:22 EST
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
The virtio-rng drivers checks for spurious callbacks. Since
callbacks can be implemented via shared interrupts (e.g. PCI) this
could lead to guest kernel oopses with lots of virtio devices.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
drivers/char/hw_random/virtio-rng.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Index: linux-2.6/drivers/char/hw_random/virtio-rng.c
===================================================================
--- linux-2.6.orig/drivers/char/hw_random/virtio-rng.c
+++ linux-2.6/drivers/char/hw_random/virtio-rng.c
@@ -37,9 +37,9 @@ static void random_recv_done(struct virt
{
int len;
- /* We never get spurious callbacks. */
+ /* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
if (!vq->vq_ops->get_buf(vq, &len))
- BUG();
+ return;
data_left = len / sizeof(random_data[0]);
complete(&have_data);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/