linux-kernel - Re: [PATCH v3] PM / sleep: prohibit devices probing during suspend/hibernation

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Message-ID: <20151115154612.GA20981@amd>
Date:	Sun, 15 Nov 2015 16:46:12 +0100
From:	Pavel Machek <pavel@....cz>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, Len Brown <len.brown@...el.com>,
	linux-kernel@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH v3] PM / sleep: prohibit devices probing during
 suspend/hibernation

On Tue 2015-11-10 11:42:34, Grygorii Strashko wrote:
> It is unsafe [1] if probing of devices will happen during suspend or
> hibernation and system behavior will be unpredictable in this case.
> So, let's prohibit device's probing in dpm_prepare() and defer their
> probing instead. The normal behavior will be restored in
> dpm_complete().
> 
> This patch introduces new DD core APIs:
>  device_block_probing()
>    It will disable probing of devices and defer their probes instead.
>  device_unblock_probing()
>    It will restore normal behavior and trigger re-probing of deferred
>    devices.
> 
> [1] https://lkml.org/lkml/2015/9/11/554
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Acked-by: Pavel Machek <pavel@....cz>

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