Patch "backlight/gpio_backlight: Compare against struct fb_info.device" has been added to the 5.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    backlight/gpio_backlight: Compare against struct fb_info.device

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     backlight-gpio_backlight-compare-against-struct-fb_info.device.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 7b91d017f77c1bda56f27c2f4bbb70de7c6eca08 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tue, 13 Jun 2023 13:06:38 +0200
Subject: backlight/gpio_backlight: Compare against struct fb_info.device

From: Thomas Zimmermann <tzimmermann@suse.de>

commit 7b91d017f77c1bda56f27c2f4bbb70de7c6eca08 upstream.

Struct gpio_backlight_platform_data refers to a platform device within
the Linux device hierarchy. The test in gpio_backlight_check_fb()
compares it against the fbdev device in struct fb_info.dev, which
is different. Fix the test by comparing to struct fb_info.device.

Fixes a bug in the backlight driver and prepares fbdev for making
struct fb_info.dev optional.

v2:
	* move renames into separate patch (Javier, Sam, Michael)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 8b770e3c9824 ("backlight: Add GPIO-based backlight driver")
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Lee Jones <lee@kernel.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: linux-sh@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v3.12+
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-4-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/video/backlight/gpio_backlight.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -46,7 +46,7 @@ static int gpio_backlight_check_fb(struc
 {
 	struct gpio_backlight *gbl = bl_get_data(bl);
 
-	return gbl->fbdev == NULL || gbl->fbdev == info->dev;
+	return gbl->fbdev == NULL || gbl->fbdev == info->device;
 }
 
 static const struct backlight_ops gpio_backlight_ops = {


Patches currently in stable-queue which might be from tzimmermann@suse.de are

queue-5.4/backlight-gpio_backlight-compare-against-struct-fb_info.device.patch
queue-5.4/backlight-lv5207lp-compare-against-struct-fb_info.device.patch
queue-5.4/backlight-bd6107-compare-against-struct-fb_info.device.patch