diff mbox series

[01/18] backlight: Constify lcd_ops

Message ID 20240414-video-backlight-lcd-ops-v1-1-9b37fcbf546a@kernel.org (mailing list archive)
State Handled Elsewhere
Headers show
Series backlight: Constify lcd_ops | expand

Commit Message

Krzysztof Kozlowski April 14, 2024, 4:35 p.m. UTC 
'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(-)

Comments

Daniel Thompson April 15, 2024, 12:46 p.m. UTC | #1 
On Sun, Apr 14, 2024 at 06:35:59PM +0200, Krzysztof Kozlowski wrote:
> '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>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.
diff mbox series

Patch

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);