提交 f6252114 编写于 作者: D Dave Airlie

vgaarb: a NULL bridge is acceptable for root devices.

I assumed all PCI buses had a bridge, but playing with qemu recently, I
discovered vgaarb bug where it wasn't detecting both devices shared a bridge
at the root level.

Don't check for NULL, if two buses have a NULL bridge, assume they share the
root bus.
Acked-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>
上级 d53dab3a
......@@ -465,31 +465,29 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
while (new_bus) {
new_bridge = new_bus->self;
if (new_bridge) {
/* go through list of devices already registered */
list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
bus = same_bridge_vgadev->pdev->bus;
bridge = bus->self;
/* see if the share a bridge with this device */
if (new_bridge == bridge) {
/* if their direct parent bridge is the same
as any bridge of this device then it can't be used
for that device */
same_bridge_vgadev->bridge_has_one_vga = false;
}
/* go through list of devices already registered */
list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
bus = same_bridge_vgadev->pdev->bus;
bridge = bus->self;
/* see if the share a bridge with this device */
if (new_bridge == bridge) {
/* if their direct parent bridge is the same
as any bridge of this device then it can't be used
for that device */
same_bridge_vgadev->bridge_has_one_vga = false;
}
/* now iterate the previous devices bridge hierarchy */
/* if the new devices parent bridge is in the other devices
hierarchy then we can't use it to control this device */
while (bus) {
bridge = bus->self;
if (bridge) {
if (bridge == vgadev->pdev->bus->self)
vgadev->bridge_has_one_vga = false;
}
bus = bus->parent;
/* now iterate the previous devices bridge hierarchy */
/* if the new devices parent bridge is in the other devices
hierarchy then we can't use it to control this device */
while (bus) {
bridge = bus->self;
if (bridge) {
if (bridge == vgadev->pdev->bus->self)
vgadev->bridge_has_one_vga = false;
}
bus = bus->parent;
}
}
new_bus = new_bus->parent;
......
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