linux-kernel - Re: [PATCH] bus: ti-sysc: Fix gpt12 system timer issue with reserved status

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Date:   Tue, 10 Aug 2021 14:40:07 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Tony Lindgren <tony@...mide.com>, sashal@...nel.org
Cc:     linux-omap@...r.kernel.org, Dave Gerlach <d-gerlach@...com>,
        Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Suman Anna <s-anna@...com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Jarkko Nikula <jarkko.nikula@...mer.com>
Subject: Re: [PATCH] bus: ti-sysc: Fix gpt12 system timer issue with reserved
 status

Hi!

I noticed the issue while reviewing stable kernels, as this is being
backported.

> Jarkko Nikula <jarkko.nikula@...mer.com> reported that Beagleboard
> revision c2 stopped booting. Jarkko bisected the issue down to
> commit 6cfcd5563b4f ("clocksource/drivers/timer-ti-dm: Fix suspend
> and resume for am3 and am4").
> 
> Let's fix the issue by tagging system timers as reserved rather than
> ignoring them. And let's not probe any interconnect target module child
> devices for reserved modules.

+++ b/drivers/bus/ti-sysc.c
> @@ -3093,8 +3095,8 @@ static int sysc_probe(struct platform_device *pdev)
>  		return error;
>  
>  	error = sysc_check_active_timer(ddata);
> -	if (error)
> -		return error;
> +	if (error == -EBUSY)
> +		ddata->reserved = true;
>  
>  	error = sysc_get_clocks(ddata);
>  	if (error)

What is going on here? First, we silently ignore errors other than
EBUSY. Second, sysc_check_active_timer() can't return -EBUSY: it
returns either 0 or -ENXIO. (I checked 5.10-stable, mainline and
-next-20210806).

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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