Messages in this thread Patch in this message |  | | From | Larry Finger <> | Subject | Regression in kernel 4.9-rcX - bisected to commit a481daa88fd4 | Date | Sun, 30 Oct 2016 18:32:41 -0500 |
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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 b/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 *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) { drm_dp_aux_unregister(&radeon_connector->ddc_bus->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.
Larry
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