linux-kernel - Re: [PATCH] clk: at91: avoid sleeping early

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Date:   Mon, 23 Sep 2019 23:34:03 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] clk: at91: avoid sleeping early

On 23/09/2019 09:58:47-0700, Stephen Boyd wrote:
> Quoting Alexandre Belloni (2019-09-20 08:39:06)
> > It is not allowed to sleep to early in the boot process and this may lead
> > to kernel issues if the bootloader didn't prepare the slow clock and main
> > clock.
> > 
> > This results in the following error and dump stack on the AriettaG25:
> >    bad: scheduling from the idle thread!
> > 
> > Ensure it is possible to sleep, else simply have a delay.
> > 
> > Reported-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > ---
> > 
> > Note that this was already discussed a while ago and Arnd said this approach was
> > reasonable:
> >   https://lore.kernel.org/lkml/6120818.MyeJZ74hYa@wuerfel/
> 
> Does this need a Fixes: tag?
> 

I'm not sure how far this can get backported

Fixes: 80eded6ce8bb ("clk: at91: add slow clks driver")


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com