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 <[email protected]>
> Cc: Linus Walleij <[email protected]>
> Cc: Sam Ravnborg <[email protected]>
> Cc: Laurent Pinchart <[email protected]>
> Cc: Thierry Reding <[email protected]>
> Cc: Maarten Lankhorst <[email protected]>
> Cc: Sean Paul <[email protected]>
> Cc: David Airlie <[email protected]>
> Cc: Daniel Vetter <[email protected]>
> Cc: Maxime Ripard <[email protected]>
> Cc: [email protected]
> Signed-off-by: Andy Shevchenko <[email protected]>
Yes, that fixes the build error. Thanks.
Acked-by: Randy Dunlap <[email protected]> # 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
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