linux-kernel - Re: [PATCH] leds: triggers: flush pending brightness before activating trigger

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Date: Thu, 13 Jun 2024 16:02:46 +0100
From: Lee Jones <lee@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Pavel Machek <pavel@....cz>,
	Jacek Anaszewski <jacek.anaszewski@...il.com>,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dustin Howett <dustin@...ett.net>
Subject: Re: [PATCH] leds: triggers: flush pending brightness before
 activating trigger

On Mon, 03 Jun 2024, Thomas Weißschuh wrote:

> The race fixed in timer_trig_activate() between a blocking
> set_brightness() call and trigger->activate() can affect any trigger.
> So move the call to flush_work() into led_trigger_set() where it can
> avoid the race for all triggers.
> 
> Fixes: 0db37915d912 ("leds: avoid races with workqueue")
> Fixes: 8c0f693c6eff ("leds: avoid flush_work in atomic context")
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Dustin, could you validate that this fixes the issue you encountered in
> the cros_ec led driver?
> ---
>  drivers/leds/led-triggers.c          | 10 ++++++++--
>  drivers/leds/trigger/ledtrig-timer.c |  5 -----
>  2 files changed, 8 insertions(+), 7 deletions(-)

This patch clashes with:

  https://lore.kernel.org/all/20240531120124.75662-1-hdegoede@redhat.com/

Please rebase and ensure that your solution doesn't conflict.

-- 
Lee Jones [李琼斯]