[PATCH 6.1 538/600] backlight/gpio_backlight: Compare against struct fb_info.device

[Greg Kroah-Hartman]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Zimmermann <tzimmermann at 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 at suse.de>
Fixes: 8b770e3c9824 ("backlight: Add GPIO-based backlight driver")
Cc: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
Cc: Rich Felker <dalias at libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz at physik.fu-berlin.de>
Cc: Lee Jones <lee at kernel.org>
Cc: Daniel Thompson <daniel.thompson at linaro.org>
Cc: Jingoo Han <jingoohan1 at gmail.com>
Cc: linux-sh at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v3.12+
Reviewed-by: Sam Ravnborg <sam at ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson at linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-4-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh at 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
@@ -35,7 +35,7 @@ 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 = {