[PATCH] drm: Skip drm_mode_config_validate() for !modeset

[PATCH] drm: Skip drm_mode_config_validate() for !modeset

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

drm_mode_config_init() may not have been called when the driver/device
doesn't support modeset. That will cause drm_mode_config_validate()
to oops. Skip the validation for !modeset.

TODO: We may want to consider calling drm_mode_config_init()
unconditionally to avoid similar issues elsewhere...

Fixes: 74d2aacbe840 ("drm: Validate encoder->possible_clones")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/drm_mode_config.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 55322d7048f5..e1ec1bb7068d 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -608,6 +608,9 @@ void drm_mode_config_validate(struct drm_device *dev)
 {
 	struct drm_encoder *encoder;
 
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return;
+
 	drm_for_each_encoder(encoder, dev)
 		fixup_encoder_possible_clones(encoder);
 
-- 
2.24.1

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Re: [PATCH] drm: Skip drm_mode_config_validate() for !modeset

[Chris Wilson]

Quoting Ville Syrjala (2020-03-18 18:25:18)
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> drm_mode_config_init() may not have been called when the driver/device
> doesn't support modeset. That will cause drm_mode_config_validate()
> to oops. Skip the validation for !modeset.
> 
> TODO: We may want to consider calling drm_mode_config_init()
> unconditionally to avoid similar issues elsewhere...
> 
> Fixes: 74d2aacbe840 ("drm: Validate encoder->possible_clones")
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
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Re: [PATCH] drm: Skip drm_mode_config_validate() for !modeset

[Ville Syrjälä]

On Wed, Mar 18, 2020 at 06:31:16PM +0000, Chris Wilson wrote:
> Quoting Ville Syrjala (2020-03-18 18:25:18)
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > drm_mode_config_init() may not have been called when the driver/device
> > doesn't support modeset. That will cause drm_mode_config_validate()
> > to oops. Skip the validation for !modeset.
> > 
> > TODO: We may want to consider calling drm_mode_config_init()
> > unconditionally to avoid similar issues elsewhere...
> > 
> > Fixes: 74d2aacbe840 ("drm: Validate encoder->possible_clones")
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Thanks. Looks like this gets BAT up and running again so pushing w/o
waiting for shards.

Sorry about the mess everyone. CI had turned a blind eye on the
regressing series and I didn't notice that fact. I need to adjust my
brain regex to look for *all* CI mails, not just the failures.

-- 
Ville Syrjälä
Intel
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