From patchwork Sun Apr 14 16:35:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 790077 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9884A134CC6; Sun, 14 Apr 2024 16:36:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713112589; cv=none; b=KDVRG3EDZHyXLJzkxK2Z2PM6enIpVVqgYuyuuNVGEqK0jZMBFv3xu1D8hy7O+/55HMGPZNoFfvJPXkgluZAGjA/a7zN53KR/ghjt0t4WOC3qqQHEcyNyIECP18eLtHdFk3u5pYitcE2wgavGa86fJevq6rV+uD7qxuSNW5BO9gk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713112589; c=relaxed/simple; bh=z5qAb/aZb4HJjU1nY0q3WFWS8153iumjRfnCENwhTpU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=OAuZzTUOnQiPMd5Aqx08nUVOVEU6UEPvvTjtDPf9aRhQG+q/Q2TWLdRbUfrE7juMyr1RLCQfoExcy+VZM5KXmrEY/EQqg7HoXOL0F607e9rNIQPVESSD4eNdibCvINYBkEZ5/uDoq1TzxPqLh0bEO3hssgjWWxjX0917n7brK6E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kKfVuIO1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kKfVuIO1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5E44C2BD10; Sun, 14 Apr 2024 16:36:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713112589; bh=z5qAb/aZb4HJjU1nY0q3WFWS8153iumjRfnCENwhTpU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=kKfVuIO1xTF9DBQQsqJ+6JFm4fxOw4LuXEUKEKd6tnfwwpnuRomxK+B9pljOtcD4v YouAYjf7moCi0CFFtrhb3alKwZwkbtZuG7Wx6wqy0TPxIgJmH/nWApc+HNtUr/L7Dm DGfuIEFxJy6TZHNc3KQ7WSgt7dC45P3ICGVdbeyeUhtSZhchR1cTxPHD/iZaRN4TqG 2UBEyPTWQJzYMAIZ5Gx+ZsPeIo4WdMs6AdoAGA/OjqUWUSnpH++t24Q8QjqL2jy2eI ftR1iiKx0JKuZMxHz9rIFaHdHCwq1CklG3WwNnCn3sacQ/3MtLyVf4GvyWcNg1KbjT qvx4Kayf1OkOQ== From: Krzysztof Kozlowski Date: Sun, 14 Apr 2024 18:35:59 +0200 Subject: [PATCH 01/18] backlight: Constify lcd_ops Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 , Daniel Thompson , Jingoo Han , Helge Deller , =?utf-8?q?Bruno_Pr=C3=A9mont?= , Jiri Kosina , Benjamin Tissoires , Alexander Shiyan , Sascha Hauer , Pengutronix Kernel Team , Shawn Guo , Fabio Estevam 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 X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2432; i=krzk@kernel.org; h=from:subject:message-id; bh=z5qAb/aZb4HJjU1nY0q3WFWS8153iumjRfnCENwhTpU=; b=owEBbQKS/ZANAwAKAcE3ZuaGi4PXAcsmYgBmHAXz9nDuruVnQoZBQ+0fvh2Ilb98JS2983g+e dDhNnweDlKJAjMEAAEKAB0WIQTd0mIoPREbIztuuKjBN2bmhouD1wUCZhwF8wAKCRDBN2bmhouD 1zUHD/9QO+vhmEA35mCEGjhMycJkhHR2vbsqoQiS9B393cyyor52W46seZkdDRv18gL3cbFaDq2 GCW5CEXQE9OJa0LEsHI7ykKwU3SqAfxAxKCN0YhqB5slN79oYKV6KRlmhG8nWYjYcXFV1oPHiI9 BJhILiYxFy6vem5nw57qJrey+rFLPDTFHkHEQkOzxwzd1unlOXoRcfoytgRIKAWu9rVk41JsCtJ 7KxGDdzDvu58gU1auOAVNqsi8YWioXvHM19X6iz6H01pcLhyLh2WGqX+yj57jExX6ZD++m5WiTM 2hekdsNXZFjUdKYwuCRBzFtXUNE9KTFrwBThUGXnqzOm5FGTRRGWm6FwdE11Me9AKw8BMP2/o8h YFIYnVZfsXpKKRBKHJQcxnNNMitFUTMCTPOo09tw7DR2AyD2Fe4uOeXwydRKcy7gq2F+elUUk9g OJzlWh6xG3J3JudxnCnlhoUm1KJuaC2EtnDvNAwrexCvb6vM30L57uJJ+FkG7VVQqh6ateR6Imb +ZDLnIWcXbCvG2yzKPCJaxult4EwJcoaGxtqter5TE2qQwH9fzTnL2ZvT2Ys7S5WpH2jxzyzGi9 mJhk+x5ZEBYBSTkV8K+fcR892HowQF0f4HBC+KM9bRlaDZaymgrH6pVnmKj5BDTzXV+tvOY4wYD 7R7nFE7ZkRksu7g== X-Developer-Key: i=krzk@kernel.org; a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B '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 --- 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);