From e5b89542ea18020961882228c26db3ba87f6e608 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 23 Apr 2009 16:42:59 +0930 Subject: [PATCH] virtio-rng: Remove false BUG for spurious callbacks 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 Cc: Rusty Russell Cc: stable@kernel.org Signed-off-by: Linus Torvalds --- drivers/char/hw_random/virtio-rng.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c index d0e563e4fc3..86e83f88313 100644 --- a/drivers/char/hw_random/virtio-rng.c +++ b/drivers/char/hw_random/virtio-rng.c @@ -37,9 +37,9 @@ static void random_recv_done(struct virtqueue *vq) { 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); -- 2.11.4.GIT