linux-kernel - [PATCH v2 03/38] backlight/gpio_backlight: Compare against struct fb

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Message-ID: <20230612141352.29939-4-tzimmermann@suse.de>
Date:   Mon, 12 Jun 2023 16:07:41 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     daniel@...ll.ch, javierm@...hat.com, sam@...nborg.org,
        deller@....de, geert+renesas@...der.be, lee@...nel.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com,
        dan.carpenter@...aro.org, michael.j.ruhl@...el.com
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-sh@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        stable@...r.kernel.org
Subject: [PATCH v2 03/38] backlight/gpio_backlight: Compare against struct fb_info.device

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@...e.de>
Fixes: 8b770e3c9824 ("backlight: Add GPIO-based backlight driver")
Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc: Rich Felker <dalias@...c.org>
Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: Lee Jones <lee@...nel.org>
Cc: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Jingoo Han <jingoohan1@...il.com>
Cc: linux-sh@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: <stable@...r.kernel.org> # v3.12+
---
 drivers/video/backlight/gpio_backlight.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 6f78d928f054a..5c5c99f7979e3 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -35,7 +35,7 @@ static int gpio_backlight_check_fb(struct backlight_device *bl,
 {
 	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 = {
-- 
2.41.0