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vgaarb: a NULL bridge is acceptable for root devices.

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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: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2011-10-10 09:29:18 +01:00
parent d53dab3ae1
commit f6252114cb
1 changed files with 21 additions and 23 deletions
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2
drivers/gpu/vga/vgaarb.c
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@@ -465,7 +465,6 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
while (new_bus) { while (new_bus) {
new_bridge = new_bus->self; new_bridge = new_bus->self;
if (new_bridge) {
/* go through list of devices already registered */ /* go through list of devices already registered */
list_for_each_entry(same_bridge_vgadev, &vga_list, list) { list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
bus = same_bridge_vgadev->pdev->bus; bus = same_bridge_vgadev->pdev->bus;
@@ -491,7 +490,6 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
bus = bus->parent; bus = bus->parent;
} }
} }
}
new_bus = new_bus->parent; new_bus = new_bus->parent;
} }
} }