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virtio-pci: do not oops on config change if driver not loaded 

The host really shouldn't be notifying us of config changes
before the device status is VIRTIO_CONFIG_S_DRIVER or
VIRTIO_CONFIG_S_DRIVER_OK.

However, if we do happen to be interrupted while we're not
attached to a driver, we really shouldn't oops. Prevent
this simply by checking that device->driver is non-NULL
before trying to notify the driver of config changes.

Problem observed by doing a "set_link virtio.0 down" with
QEMU before the net driver had been loaded.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mark McLoughlin 2009-02-03 13:33:53 +10:30 committed by Linus Torvalds
parent 720eba31f4
commit 3fff0179e3
1 changed files with 1 additions and 1 deletions
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2
drivers/virtio/virtio_pci.c
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@ -192,7 +192,7 @@ static irqreturn_t vp_interrupt(int irq, void *opaque)
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
if (drv->config_changed)
if (drv && drv->config_changed)
drv->config_changed(&vp_dev->vdev);
}