virtio-pci: disable msi at startup
authorMichael S. Tsirkin <mst@redhat.com>
Thu, 24 Jun 2010 04:49:06 +0000 (22:49 -0600)
committerRusty Russell <rusty@rustcorp.com.au>
Wed, 23 Jun 2010 13:19:07 +0000 (22:19 +0930)
commitb03214d559471359e2a85ae256686381d0672f29
treeb2c5d617304bffc8dd4917ecef251ec109eb3b8b
parent686d363786a53ed28ee875b84ef24e6d5126ef6f
virtio-pci: disable msi at startup

virtio-pci resets the device at startup by writing to the status
register, but this does not clear the pci config space,
specifically msi enable status which affects register
layout.

This breaks things like kdump when they try to use e.g. virtio-blk.

Fix by forcing msi off at startup. Since pci.c already has
a routine to do this, we export and use it instead of duplicating code.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
drivers/pci/pci.c
drivers/virtio/virtio_pci.c