* linux-stable 6.1.53 kernel crash on COLOR_ID_MULTI handling change
@ 2023-09-13 18:57 Da Xue
2023-09-14 10:21 ` Pavel Machek
0 siblings, 1 reply; 3+ messages in thread
From: Da Xue @ 2023-09-13 18:57 UTC (permalink / raw)
To: Pavel Machek, linux-leds, linux-kernel, linux-stable
Hi Pavel,
We have running systems that use COLOR_ID_MULTI. The GPIO toggles
between two colors and we have used the identifier. RGB is not a good
fit since it is not a RGB LED. Please provide guidance.
This patch causes the system to not start: f741121a2251 leds: Fix
BUG_ON check for LED_COLOR_ID_MULTI that is always false
It was also backported to stable causing previously booting systems to
no longer boot.
Best,
Da Xue
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: linux-stable 6.1.53 kernel crash on COLOR_ID_MULTI handling change
2023-09-13 18:57 linux-stable 6.1.53 kernel crash on COLOR_ID_MULTI handling change Da Xue
@ 2023-09-14 10:21 ` Pavel Machek
2023-09-18 14:11 ` Marek Behún
0 siblings, 1 reply; 3+ messages in thread
From: Pavel Machek @ 2023-09-14 10:21 UTC (permalink / raw)
To: Da Xue, kabel, lee, sashal; +Cc: linux-leds, linux-kernel, linux-stable
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Hi!
> We have running systems that use COLOR_ID_MULTI. The GPIO toggles
> between two colors and we have used the identifier. RGB is not a good
> fit since it is not a RGB LED. Please provide guidance.
>
> This patch causes the system to not start: f741121a2251 leds: Fix
> BUG_ON check for LED_COLOR_ID_MULTI that is always false
>
> It was also backported to stable causing previously booting systems to
> no longer boot.
Lets cc patch authors.
And please drop this from stable, it does not belong there.
Best regards,
Pavel
--
People of Russia, stop Putin before his war on Ukraine escalates.
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: linux-stable 6.1.53 kernel crash on COLOR_ID_MULTI handling change
2023-09-14 10:21 ` Pavel Machek
@ 2023-09-18 14:11 ` Marek Behún
0 siblings, 0 replies; 3+ messages in thread
From: Marek Behún @ 2023-09-18 14:11 UTC (permalink / raw)
To: Pavel Machek; +Cc: Da Xue, lee, sashal, linux-leds, linux-kernel, linux-stable
On Thu, 14 Sep 2023 12:21:09 +0200
Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
> > We have running systems that use COLOR_ID_MULTI. The GPIO toggles
> > between two colors and we have used the identifier. RGB is not a good
> > fit since it is not a RGB LED. Please provide guidance.
> >
> > This patch causes the system to not start: f741121a2251 leds: Fix
> > BUG_ON check for LED_COLOR_ID_MULTI that is always false
> >
> > It was also backported to stable causing previously booting systems to
> > no longer boot.
>
> Lets cc patch authors.
>
> And please drop this from stable, it does not belong there.
>
> Best regards,
> Pavel
The BUG_ON was a no-op since it was introduced. It's purpose was to
prevent people from using LED_COLOR_ID_MULTI since it was thought that
non-RGB LEDs are not yet completely agreed on, or something.
But since the BUG_ON was a no-op, someone started using
LED_COLOR_ID_MULTI without noticing that they should not. There are now
even some in-tree device-tree files using LED_COLOR_ID_MULTI.
My patch that fixes the BUG_ON uncovered this and caused a regression
for some people.
I think we have to drop the BUG_ON altoghether now.
I've sent a patch to linux-leds doing just that.
Sorry for the incovenience.
Marek
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-09-18 16:45 UTC | newest]
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2023-09-13 18:57 linux-stable 6.1.53 kernel crash on COLOR_ID_MULTI handling change Da Xue
2023-09-14 10:21 ` Pavel Machek
2023-09-18 14:11 ` Marek Behún
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