Re: [PATCH v3 2/2] drm/i915: Drop all references to DRM IRQ midlayer

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Jun 30, 2021 at 11:52:28AM +0200, Thomas Zimmermann wrote:
> Remove all references to DRM's IRQ midlayer. i915 uses Linux' interrupt
> functions directly.
> 
> v2:
> 	* also remove an outdated comment
> 	* move IRQ fix into separate patch
> 	* update Fixes tag (Daniel)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Fixes: b318b82455bd ("drm/i915: Nuke drm_driver irq vfuncs")
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: intel-gfx@lists.freedesktop.org
> Cc: <stable@vger.kernel.org> # v5.4+
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 1 -
>  drivers/gpu/drm/i915/i915_irq.c | 5 -----
>  2 files changed, 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 850b499c71c8..73de45472f60 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -42,7 +42,6 @@
>  #include <drm/drm_aperture.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_ioctl.h>
> -#include <drm/drm_irq.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_probe_helper.h>
>  
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 2203dca19895..1d4c683c9de9 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -33,7 +33,6 @@
>  #include <linux/sysrq.h>
>  
>  #include <drm/drm_drv.h>
> -#include <drm/drm_irq.h>
>  
>  #include "display/intel_de.h"
>  #include "display/intel_display_types.h"
> @@ -4564,10 +4563,6 @@ void intel_runtime_pm_enable_interrupts(struct drm_i915_private *dev_priv)
>  
>  bool intel_irqs_enabled(struct drm_i915_private *dev_priv)
>  {
> -	/*
> -	 * We only use drm_irq_uninstall() at unload and VT switch, so
> -	 * this is the only thing we need to check.
> -	 */
>  	return dev_priv->runtime_pm.irqs_enabled;
>  }
>  
> -- 
> 2.32.0
> 

How is this a stable-kernel-related fix?

thanks,

greg k-h