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[PATCH] leds: class: Don't expose color sysfs entry

Takashi Iwai posted 1 patch 2 years ago 
Documentation/ABI/testing/sysfs-class-led |  9 ---------
drivers/leds/led-class.c                  | 14 --------------
2 files changed, 23 deletions(-)
[PATCH] leds: class: Don't expose color sysfs entry
Posted by Takashi Iwai 2 years ago 
The commit c7d80059b086 ("leds: class: Store the color index in struct
led_classdev") introduced a new sysfs entry "color" that is commonly
created for the led classdev.  Unfortunately, this conflicts with the
"color" sysfs entry of already existing drivers such as Logitech HID
or System76 ACPI drivers.  The driver probe fails due to the conflict,
hence it leads to a severe regression with the missing keyboard, for
example.

This patch reverts partially the change in the commit above for
removing the led class color sysfs entries again for addressing the
regressions.  The newly introduced led_classdev.color field is kept as
it's already used by other driver.

Fixes: c7d80059b086 ("leds: class: Store the color index in struct led_classdev")
Reported-by: Johannes Penßel <johannes.penssel@gmail.com>
Closes: https://lore.kernel.org/r/b5646db3-acff-45aa-baef-df3f660486fb@gmail.com
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218045
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218155
Link: https://bugzilla.suse.com/show_bug.cgi?id=1217172
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

This is a sort of v2 patch, as it turned out that the full revert
leads to a build error.

 Documentation/ABI/testing/sysfs-class-led |  9 ---------
 drivers/leds/led-class.c                  | 14 --------------
 2 files changed, 23 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-led b/Documentation/ABI/testing/sysfs-class-led
index b2ff0012c0f2..2e24ac3bd7ef 100644
--- a/Documentation/ABI/testing/sysfs-class-led
+++ b/Documentation/ABI/testing/sysfs-class-led
@@ -59,15 +59,6 @@ Description:
 		brightness. Reading this file when no hw brightness change
 		event has happened will return an ENODATA error.
 
-What:		/sys/class/leds/<led>/color
-Date:		June 2023
-KernelVersion:	6.5
-Description:
-		Color of the LED.
-
-		This is a read-only file. Reading this file returns the color
-		of the LED as a string (e.g: "red", "green", "multicolor").
-
 What:		/sys/class/leds/<led>/trigger
 Date:		March 2006
 KernelVersion:	2.6.17
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 974b84f6bd6a..ba1be15cfd8e 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -75,19 +75,6 @@ static ssize_t max_brightness_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(max_brightness);
 
-static ssize_t color_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	const char *color_text = "invalid";
-	struct led_classdev *led_cdev = dev_get_drvdata(dev);
-
-	if (led_cdev->color < LED_COLOR_ID_MAX)
-		color_text = led_colors[led_cdev->color];
-
-	return sysfs_emit(buf, "%s\n", color_text);
-}
-static DEVICE_ATTR_RO(color);
-
 #ifdef CONFIG_LEDS_TRIGGERS
 static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
 static struct bin_attribute *led_trigger_bin_attrs[] = {
@@ -102,7 +89,6 @@ static const struct attribute_group led_trigger_group = {
 static struct attribute *led_class_attrs[] = {
 	&dev_attr_brightness.attr,
 	&dev_attr_max_brightness.attr,
-	&dev_attr_color.attr,
 	NULL,
 };
 
-- 
2.35.3
Re: [PATCH] leds: class: Don't expose color sysfs entry
Posted by Lee Jones 2 years ago 
On Tue, 21 Nov 2023 17:23:59 +0100, Takashi Iwai wrote:
> The commit c7d80059b086 ("leds: class: Store the color index in struct
> led_classdev") introduced a new sysfs entry "color" that is commonly
> created for the led classdev.  Unfortunately, this conflicts with the
> "color" sysfs entry of already existing drivers such as Logitech HID
> or System76 ACPI drivers.  The driver probe fails due to the conflict,
> hence it leads to a severe regression with the missing keyboard, for
> example.
> 
> [...]

Applied, thanks!

[1/1] leds: class: Don't expose color sysfs entry
      commit: 8f2244c9af245ff72185c0473827125ee6b2d1a5

--
Lee Jones [李琼斯]
Re: [PATCH] leds: class: Don't expose color sysfs entry
Posted by Hans de Goede 2 years ago 
Hi,

On 11/21/23 17:23, Takashi Iwai wrote:
> The commit c7d80059b086 ("leds: class: Store the color index in struct
> led_classdev") introduced a new sysfs entry "color" that is commonly
> created for the led classdev.  Unfortunately, this conflicts with the
> "color" sysfs entry of already existing drivers such as Logitech HID
> or System76 ACPI drivers.  The driver probe fails due to the conflict,
> hence it leads to a severe regression with the missing keyboard, for
> example.
> 
> This patch reverts partially the change in the commit above for
> removing the led class color sysfs entries again for addressing the
> regressions.  The newly introduced led_classdev.color field is kept as
> it's already used by other driver.
> 
> Fixes: c7d80059b086 ("leds: class: Store the color index in struct led_classdev")
> Reported-by: Johannes Penßel <johannes.penssel@gmail.com>
> Closes: https://lore.kernel.org/r/b5646db3-acff-45aa-baef-df3f660486fb@gmail.com
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218045
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218155
> Link: https://bugzilla.suse.com/show_bug.cgi?id=1217172
> Signed-off-by: Takashi Iwai <tiwai@suse.de>

Thank you for taking care of this, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans

> ---
> 
> This is a sort of v2 patch, as it turned out that the full revert
> leads to a build error.
> 
>  Documentation/ABI/testing/sysfs-class-led |  9 ---------
>  drivers/leds/led-class.c                  | 14 --------------
>  2 files changed, 23 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-led b/Documentation/ABI/testing/sysfs-class-led
> index b2ff0012c0f2..2e24ac3bd7ef 100644
> --- a/Documentation/ABI/testing/sysfs-class-led
> +++ b/Documentation/ABI/testing/sysfs-class-led
> @@ -59,15 +59,6 @@ Description:
>  		brightness. Reading this file when no hw brightness change
>  		event has happened will return an ENODATA error.
>  
> -What:		/sys/class/leds/<led>/color
> -Date:		June 2023
> -KernelVersion:	6.5
> -Description:
> -		Color of the LED.
> -
> -		This is a read-only file. Reading this file returns the color
> -		of the LED as a string (e.g: "red", "green", "multicolor").
> -
>  What:		/sys/class/leds/<led>/trigger
>  Date:		March 2006
>  KernelVersion:	2.6.17
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 974b84f6bd6a..ba1be15cfd8e 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -75,19 +75,6 @@ static ssize_t max_brightness_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(max_brightness);
>  
> -static ssize_t color_show(struct device *dev,
> -		struct device_attribute *attr, char *buf)
> -{
> -	const char *color_text = "invalid";
> -	struct led_classdev *led_cdev = dev_get_drvdata(dev);
> -
> -	if (led_cdev->color < LED_COLOR_ID_MAX)
> -		color_text = led_colors[led_cdev->color];
> -
> -	return sysfs_emit(buf, "%s\n", color_text);
> -}
> -static DEVICE_ATTR_RO(color);
> -
>  #ifdef CONFIG_LEDS_TRIGGERS
>  static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
>  static struct bin_attribute *led_trigger_bin_attrs[] = {
> @@ -102,7 +89,6 @@ static const struct attribute_group led_trigger_group = {
>  static struct attribute *led_class_attrs[] = {
>  	&dev_attr_brightness.attr,
>  	&dev_attr_max_brightness.attr,
> -	&dev_attr_color.attr,
>  	NULL,
>  };
>

Patchew 2.1-devel-b67e4c2

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