linux-kernel - Re: [PATCH] PM / Sleep: call early resume handlers when suspend

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Date:	Thu, 19 Jul 2012 11:10:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Colin Cross <ccross@...roid.com>
Cc:	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / Sleep: call early resume handlers when suspend_noirq fails

On Thursday, July 19, 2012, Colin Cross wrote:
> Commit cf579dfb82550e34de7ccf3ef090d8b834ccd3a9 (PM / Sleep: Introduce
> "late suspend" and "early resume" of devices) introduced a bug where
> suspend_late handlers would be called, but if dpm_suspend_noirq returned
> an error the early_resume handlers would never be called.  All devices
> would end up on the dpm_late_early_list, and would never be resumed
> again.
> 
> Fix it by calling dpm_resume_early when dpm_suspend_noirq returns
> an error.
> 
> Signed-off-by: Colin Cross <ccross@...roid.com>

Nice catch, thanks!

Applied, with a CC to -stable.

Thanks,
Rafael


> ---
>  drivers/base/power/main.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> index 9cb845e..742fcbe 100644
> --- a/drivers/base/power/main.c
> +++ b/drivers/base/power/main.c
> @@ -989,8 +989,16 @@ static int dpm_suspend_late(pm_message_t state)
>  int dpm_suspend_end(pm_message_t state)
>  {
>  	int error = dpm_suspend_late(state);
> +	if (error)
> +		return error;
>  
> -	return error ? : dpm_suspend_noirq(state);
> +	error = dpm_suspend_noirq(state);
> +	if (error) {
> +		dpm_resume_early(state);
> +		return error;
> +	}
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(dpm_suspend_end);
>  
> 

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