linux-kernel - Re: [PATCH 0/8] Suspend block api (version 7)

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Message-ID: <AANLkTinP68yHYfVCW-urCrRbeSb0Mlz8JsvAs-FKoUPZ@mail.gmail.com>
Date:	Sun, 16 May 2010 21:16:26 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Brian Swetland <swetland@...gle.com>
Subject: Re: [PATCH 0/8] Suspend block api (version 7)

2010/5/16 Rafael J. Wysocki <rjw@...k.pl>:
> On Friday 14 May 2010, Arve Hjønnevåg wrote:
>> This patch series adds a suspend-block api that provides the same
>> functionality as the android wakelock api. This version has some
>> changes from, or requested by, Rafael. The most notable changes are:
>> - DEFINE_SUSPEND_BLOCKER and suspend_blocker_register have been added
>>   for statically allocated suspend blockers.
>> - suspend_blocker_destroy is now called suspend_blocker_unregister
>> - The user space mandatory _INIT ioctl has been replaced with an
>>   optional _SET_NAME ioctl.
>>
>> I kept the ack and reviewed by tags on two of the patches even though
>> there were a few cosmetic changes.
>
> I have one more comment, sorry for that.
>
> Namely, if /sys/power/policy is set to "opportunistic" and "mem" is written
> into /sys/power/state and there are no suspend blockers present except for
> the main blocker (and the blockers used only for statistics), the system won't
> be able to go out of an infinit suspend-resume loop (or at least it seems
> so from reading the code).
>
> I think we should prevent that from happening somehow.
>

It should get out of that loop as soon as someone blocks suspend. If
someone is constantly aborting suspend without using a suspend blocker
it will be very inefficient, but it should still work.

-- 
Arve Hjønnevåg
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