From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: lee@kernel.org
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, daniel.thompson@linaro.org,
jingoohan1@gmail.com, deller@gmx.de,
"Ricardo B. Marliere" <ricardo@marliere.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH v2 2/2] video: backlight: lcd: make lcd_class constant
Date: Thu, 28 Mar 2024 12:59:07 +0100 [thread overview]
Message-ID: <2024032809-enchanted-conducive-3677@gregkh> (raw)
In-Reply-To: <2024032805-putdown-mushy-a0f9@gregkh>
From: "Ricardo B. Marliere" <ricardo@marliere.net>
Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the lcd_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Ricardo B. Marliere" <ricardo@marliere.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
v2: rebased on 6.9-rc1
drivers/video/backlight/lcd.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index 77c5cb2a44e2..ba4771cbd781 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -159,8 +159,6 @@ static ssize_t max_contrast_show(struct device *dev,
}
static DEVICE_ATTR_RO(max_contrast);
-static struct class *lcd_class;
-
static void lcd_device_release(struct device *dev)
{
struct lcd_device *ld = to_lcd_device(dev);
@@ -175,6 +173,11 @@ static struct attribute *lcd_device_attrs[] = {
};
ATTRIBUTE_GROUPS(lcd_device);
+static const struct class lcd_class = {
+ .name = "lcd",
+ .dev_groups = lcd_device_groups,
+};
+
/**
* lcd_device_register - register a new object of lcd_device class.
* @name: the name of the new object(must be the same as the name of the
@@ -202,7 +205,7 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
mutex_init(&new_ld->ops_lock);
mutex_init(&new_ld->update_lock);
- new_ld->dev.class = lcd_class;
+ new_ld->dev.class = &lcd_class;
new_ld->dev.parent = parent;
new_ld->dev.release = lcd_device_release;
dev_set_name(&new_ld->dev, "%s", name);
@@ -318,19 +321,19 @@ EXPORT_SYMBOL(devm_lcd_device_unregister);
static void __exit lcd_class_exit(void)
{
- class_destroy(lcd_class);
+ class_unregister(&lcd_class);
}
static int __init lcd_class_init(void)
{
- lcd_class = class_create("lcd");
- if (IS_ERR(lcd_class)) {
- pr_warn("Unable to create backlight class; errno = %ld\n",
- PTR_ERR(lcd_class));
- return PTR_ERR(lcd_class);
+ int ret;
+
+ ret = class_register(&lcd_class);
+ if (ret) {
+ pr_warn("Unable to create backlight class; errno = %d\n", ret);
+ return ret;
}
- lcd_class->dev_groups = lcd_device_groups;
return 0;
}
--
2.44.0
next prev parent reply other threads:[~2024-03-28 11:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-28 11:59 [PATCH v2 1/2] video: backlight: make backlight_class constant Greg Kroah-Hartman
2024-03-28 11:59 ` Greg Kroah-Hartman [this message]
2024-03-28 12:08 ` Lee Jones
2024-03-28 12:09 ` Lee Jones
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