[PATCH 4/4] drm/i915: Fix oops on platforms w/o hpd support

[Jani Nikula]

On Thu, 14 Oct 2021, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> We don't have hpd support on i8xx/i915 which means hotplug_funcs==NULL.
> Let's not oops when loading the driver on one those machines.

D'oh!

Lemme guess, CI just casually dropped the machines from the results
because they didn't boot?

Reviewed-by: Jani Nikula <jani.nikula at intel.com>

>
> Cc: Dave Airlie <airlied at redhat.com>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Fixes: cd030c7c11a4 ("drm/i915: constify hotplug function vtable.")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_hotplug.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> index 3c1cec953b42..0e949a258a22 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> @@ -215,7 +215,8 @@ intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
>  
>  static void intel_hpd_irq_setup(struct drm_i915_private *i915)
>  {
> -	if (i915->display_irqs_enabled && i915->hotplug_funcs->hpd_irq_setup)
> +	if (i915->display_irqs_enabled &&
> +	    i915->hotplug_funcs && i915->hotplug_funcs->hpd_irq_setup)
>  		i915->hotplug_funcs->hpd_irq_setup(i915);
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center