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SubjectRegression in kernel 4.9-rcX - bisected to commit a481daa88fd4
With the 4.9-rcX kernel, my Dell Latitude D600 laptop has a kernel panic on 
shutdown in routine radeon_connector_unregister(). This problem has been
bisected to show that commit a481daa88fd4 ("drm/radeon: always apply pci
shutdown callbacks") is at fault.

In the routine that crashes, the ddc_bus member of the struct drm_connector is
NULL, thus the following one-line (line-wrapped) patch fixes the problem:

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -931,7 +931,7 @@ static void radeon_connector_unregister(struct drm_connector
struct radeon_connector *radeon_connector = to_radeon_connector(connector);

- if (radeon_connector->ddc_bus->has_aux) {
+ if (radeon_connector->ddc_bus && radeon_connector->ddc_bus->has_aux) {
radeon_connector->ddc_bus->has_aux = false;
The above change will soon be submitted as a proper patch. This posting to LKML
is intended to publicize the regression as soon as possible.


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