From: Mark McLoughlin <markmc@redhat.com>
Date: Tue, 3 Feb 2009 03:03:53 +0000 (+1030)
Subject: virtio-pci: do not oops on config change if driver not loaded
X-Git-Tag: v2.6.29-rc4~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3fff0179e33cd7d0a688dab65700c46ad089e934;p=pandora-kernel.git

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>
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