[PATCH v2 01/10] backlight: Match backlight device against struct fb_info.bl_dev

[Thomas Zimmermann <tzimmermann@suse.de>]

Framebuffer drivers for devices with dedicated backlight are supposed
to set struct fb_info.bl_dev to the backlight's respective device. Use
the value to match backlight and framebuffer in the backlight core code.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
 drivers/video/backlight/backlight.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 86e1cdc8e3697..48844a4f28ad3 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -98,7 +98,8 @@ static int fb_notifier_callback(struct notifier_block *self,
 {
 	struct backlight_device *bd;
 	struct fb_event *evdata = data;
-	int node = evdata->info->node;
+	struct fb_info *info = evdata->info;
+	int node = info->node;
 	int fb_blank = 0;
 
 	/* If we aren't interested in this event, skip it immediately ... */
@@ -110,8 +111,12 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	if (!bd->ops)
 		goto out;
-	if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
+	else if (bd->ops->check_fb && !bd->ops->check_fb(bd, info))
 		goto out;
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
+	else if (info->bl_dev && info->bl_dev != bd)
+		goto out;
+#endif
 
 	fb_blank = *(int *)evdata->data;
 	if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
-- 
2.43.0