linux-kernel - Re: apm emulation driver broken ?

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Message-ID: <473EAC1A.1000205@gmail.com>
Date:	Sat, 17 Nov 2007 09:53:46 +0100
From:	Franck Bui-Huu <vagabon.xyz@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-pm@...ts.linux-foundation.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: apm emulation driver broken ?

Rafael J. Wysocki wrote:
> However, using PF_NOFREEZE to prevent this from happening doesn't seem to be
> a good idea.
> 

Indeed but...

> I'd probably use wait_event_freezable() (defined in
> include/linux/freezer.h) for that.

...I would just revert this bits from now to make sure this driver
work again for v2.6.24.
 
> It tries to send them fake signals and waits for them to freeze.  If
> they don't freeze within the timeout, it fails and clears their
> TIF_FREEZE bits.

But send_fake_signal() seems to wake up task in INTERRUPTIBLE state
only. Looking at signal_wake_up(), it basically do:

	wake_up_state(t, TASK_INTERRUPTIBLE);

What am I missing ?

		Franck

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