netdev - Re: [PATCH RESEND 1/4] leds: Change led_trigger_blink[_oneshot]() delay parameters to pass-by-value

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Date: Thu, 11 May 2023 07:53:09 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Hans de Goede <hdegoede@...hat.com>
Cc: Pavel Machek <pavel@....cz>,
	Jacek Anaszewski <jacek.anaszewski@...il.com>,
	Lee Jones <lee@...nel.org>, Sebastian Reichel <sre@...nel.org>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Johannes Berg <johannes@...solutions.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>, linux-leds@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, Yauhen Kharuzhy <jekhor@...il.com>
Subject: Re: [PATCH RESEND 1/4] leds: Change led_trigger_blink[_oneshot]()
 delay parameters to pass-by-value

On Wed, May 10, 2023 at 06:22:31PM +0200, Hans de Goede wrote:
> led_blink_set[_oneshot]()'s delay_on and delay_off function parameters
> are pass by reference, so that hw-blink implementations can report
> back the actual achieved delays when the values have been rounded
> to something the hw supports.
> 
> This is really only interesting for the sysfs API / the timer trigger.
> Other triggers don't really care about this and none of the callers of
> led_trigger_blink[_oneshot]() do anything with the returned delay values.
> 
> Change the led_trigger_blink[_oneshot]() delay parameters to pass-by-value,
> there are 2 reasons for this:
> 
> 1. led_cdev->blink_set() may sleep, while led_trigger_blink() may not.
> So on hw where led_cdev->blink_set() sleeps the call needs to be deferred
> to a workqueue, in which case the actual achieved delays are unknown
> (this is a preparation patch for the deferring).
> 
> 2. Since the callers don't care about the actual achieved delays, allowing
> callers to directly pass a value leads to simpler code for most callers.
> 
> Reviewed-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
> Tested-by: Yauhen Kharuzhy <jekhor@...il.com>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>