Re: [PATCH v1 1/1] drm/drm_panel: Fix EXPORT of drm_panel_of_backlight() one more time

[Randy Dunlap <rdunlap@infradead.org>]

On 12/17/19 6:07 AM, Andy Shevchenko wrote:
> The initial commit followed by the fix didn't take into consideration the case
> 
> CONFIG_DRM_PANEL=y
> CONFIG_BACKLIGHT_CLASS_DEVICE=m
> CONFIG_DRM_I915=y
> 
> where symbol devm_of_find_backlight() is not reachable from DRM subsystem.
> Quick fix is to avoid drm_panel_of_backlight() from exporting in such case.
> 
> Fixes: 907aa265fde6 ("drm/drm_panel: fix EXPORT of drm_panel_of_backlight")
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Sean Paul <sean@poorly.run>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Yes, that fixes the build error.  Thanks.

Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested


> ---
>  drivers/gpu/drm/drm_panel.c | 2 +-
>  include/drm/drm_panel.h     | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index 79ff3fdf6f6e..8c7bac85a793 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -302,7 +302,7 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np)
>  EXPORT_SYMBOL(of_drm_find_panel);
>  #endif
>  
> -#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
> +#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)
>  /**
>   * drm_panel_of_backlight - use backlight device node for backlight
>   * @panel: DRM panel
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index 5f27b693e1a0..121f7aabccd1 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -198,7 +198,7 @@ static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
>  }
>  #endif
>  
> -#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
> +#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)
>  int drm_panel_of_backlight(struct drm_panel *panel);
>  #else
>  static inline int drm_panel_of_backlight(struct drm_panel *panel)
> 


-- 
~Randy