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virtio: don't crash when device is buggy 

Because of a sanity check in virtio_dev_remove, a buggy device can crash
kernel.  And in case of rproc it's userspace so it's not a good idea.
We are unloading a driver so how bad can it be?
Be less aggressive in handling this error: if it's a driver bug,
warning once should be enough.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2012-09-28 15:05:16 +09:30 committed by Rusty Russell
parent eccbb05a64
commit 5543a6ac31
1 changed files with 1 additions and 1 deletions
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2
drivers/virtio/virtio.c
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@ -159,7 +159,7 @@ static int virtio_dev_remove(struct device *_d)
drv->remove(dev);
/* Driver should have reset device. */
BUG_ON(dev->config->get_status(dev));
WARN_ON_ONCE(dev->config->get_status(dev));
/* Acknowledge the device's existence again. */
add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);