* [PATCH] virtio-rng: Remove false BUG for spurious callbacks
@ 2009-04-23 7:12 Rusty Russell
0 siblings, 0 replies; 3+ messages in thread
From: Rusty Russell @ 2009-04-23 7:12 UTC (permalink / raw)
To: Linus Torvalds
Cc: Christian Borntraeger, stable, linux-kernel, virtualization
From: Christian Borntraeger <borntraeger@de.ibm.com>
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@de.ibm.com>
---
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);
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] virtio-rng: Remove false BUG for spurious callbacks
[not found] <200904231642.59939.rusty@rustcorp.com.au>
@ 2009-04-24 15:23 ` Linus Torvalds
2009-04-26 13:00 ` Rusty Russell
0 siblings, 1 reply; 3+ messages in thread
From: Linus Torvalds @ 2009-04-24 15:23 UTC (permalink / raw)
To: Rusty Russell; +Cc: Christian Borntraeger, stable, linux-kernel, virtualization
On Thu, 23 Apr 2009, Rusty Russell wrote:
>
> From: Christian Borntraeger <borntraeger@de.ibm.com>
>
> 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@de.ibm.com>
> ---
I really would have liked a sign-off from you too, rusty. I'll take it
as-is, since it's trivial, but just a note..
Linus
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] virtio-rng: Remove false BUG for spurious callbacks
2009-04-24 15:23 ` [PATCH] virtio-rng: Remove false BUG for spurious callbacks Linus Torvalds
@ 2009-04-26 13:00 ` Rusty Russell
0 siblings, 0 replies; 3+ messages in thread
From: Rusty Russell @ 2009-04-26 13:00 UTC (permalink / raw)
To: Linus Torvalds
Cc: Christian Borntraeger, stable, linux-kernel, virtualization
On Sat, 25 Apr 2009 12:53:12 am Linus Torvalds wrote:
>
> On Thu, 23 Apr 2009, Rusty Russell wrote:
> >
> > From: Christian Borntraeger <borntraeger@de.ibm.com>
> >
> > 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@de.ibm.com>
> > ---
>
> I really would have liked a sign-off from you too, rusty. I'll take it
> as-is, since it's trivial, but just a note..
Sorry, missed that one.
Thanks for the reminder,
Rusty.
^ permalink raw reply [flat|nested] 3+ messages in thread
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