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From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Sun, 14 Apr 2024 18:35:59 +0200
Subject: [PATCH 01/18] backlight: Constify lcd_ops
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Message-Id: <20240414-video-backlight-lcd-ops-v1-1-9b37fcbf546a@kernel.org>
References: <20240414-video-backlight-lcd-ops-v1-0-9b37fcbf546a@kernel.org>
In-Reply-To: <20240414-video-backlight-lcd-ops-v1-0-9b37fcbf546a@kernel.org>
To: Lee Jones <lee@kernel.org>, 
 Daniel Thompson <daniel.thompson@linaro.org>, 
 Jingoo Han <jingoohan1@gmail.com>, Helge Deller <deller@gmx.de>, 
 =?utf-8?q?Bruno_Pr=C3=A9mont?= <bonbons@linux-vserver.org>, 
 Jiri Kosina <jikos@kernel.org>, Benjamin Tissoires <bentiss@kernel.org>, 
 Alexander Shiyan <shc_work@mail.ru>, Sascha Hauer <s.hauer@pengutronix.de>, 
 Pengutronix Kernel Team <kernel@pengutronix.de>, 
 Shawn Guo <shawnguo@kernel.org>, Fabio Estevam <festevam@gmail.com>
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, 
 linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, 
 linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, 
 linux-omap@vger.kernel.org, Krzysztof Kozlowski <krzk@kernel.org>

'struct lcd_ops' passed in lcd_device_register() is not modified by core
backlight code, so it can be made const for code safety.  This allows
drivers to also define the structure as const.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/video/backlight/lcd.c | 4 ++--
 include/linux/lcd.h           | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index ba4771cbd781..ceec90ca758b 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -191,7 +191,7 @@ static const struct class lcd_class = {
  * or a pointer to the newly allocated device.
  */
 struct lcd_device *lcd_device_register(const char *name, struct device *parent,
-		void *devdata, struct lcd_ops *ops)
+		void *devdata, const struct lcd_ops *ops)
 {
 	struct lcd_device *new_ld;
 	int rc;
@@ -279,7 +279,7 @@ static int devm_lcd_device_match(struct device *dev, void *res, void *data)
  */
 struct lcd_device *devm_lcd_device_register(struct device *dev,
 		const char *name, struct device *parent,
-		void *devdata, struct lcd_ops *ops)
+		void *devdata, const struct lcd_ops *ops)
 {
 	struct lcd_device **ptr, *lcd;
 
diff --git a/include/linux/lcd.h b/include/linux/lcd.h
index 238fb1dfed98..68703a51dc53 100644
--- a/include/linux/lcd.h
+++ b/include/linux/lcd.h
@@ -61,7 +61,7 @@ struct lcd_device {
 	   points to something in the body of that driver, it is also invalid. */
 	struct mutex ops_lock;
 	/* If this is NULL, the backing module is unloaded */
-	struct lcd_ops *ops;
+	const struct lcd_ops *ops;
 	/* Serialise access to set_power method */
 	struct mutex update_lock;
 	/* The framebuffer notifier block */
@@ -102,10 +102,10 @@ static inline void lcd_set_power(struct lcd_device *ld, int power)
 }
 
 extern struct lcd_device *lcd_device_register(const char *name,
-	struct device *parent, void *devdata, struct lcd_ops *ops);
+	struct device *parent, void *devdata, const struct lcd_ops *ops);
 extern struct lcd_device *devm_lcd_device_register(struct device *dev,
 	const char *name, struct device *parent,
-	void *devdata, struct lcd_ops *ops);
+	void *devdata, const struct lcd_ops *ops);
 extern void lcd_device_unregister(struct lcd_device *ld);
 extern void devm_lcd_device_unregister(struct device *dev,
 	struct lcd_device *ld);

-- 
2.34.1