linux-kernel - Re: software suspend doesn't work with 2.6.22-rc3

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Message-Id: <1180215220.5493.36.camel@nigel.suspend2.net>
Date:	Sun, 27 May 2007 07:33:40 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Maximilian Engelhardt <maxi@...monizer.de>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: software suspend doesn't work with 2.6.22-rc3

Hi.

On Sat, 2007-05-26 at 14:49 +0200, Maximilian Engelhardt wrote:
> On Saturday 26 May 2007, Nigel Cunningham wrote:
> > Hi.
> >
> > On Sat, 2007-05-26 at 11:28 +0200, Maximilian Engelhardt wrote:
> > > Hello,
> > >
> > > When I try software suspend on my laptop it always returns to my running
> > > system after some time.
> > > This is what's logged by the kernel:
> > >
> > > swsusp: Basic memory bitmaps created
> > > Stopping tasks ...
> > > Stopping kernel threads timed out after 20 seconds (1 tasks refusing to
> > > freeze):
> > >  cryptd
> > > Restarting tasks ... done.
> > > swsusp: Basic memory bitmaps freed
> > >
> > > I have no idea what's the problem, but if you tell me what I should do I
> > > can create debugging information and/or test patches.
> >
> > Could you try this patch, please? It should help.
> >
> > Herbert, is this right? If cryptd is going to be used for block devs,
> > the task should probably be PF_NOFREEZE (or whatever it is today)
> > instead.
> >
> > Regards,
> >
> > Nigel
> >
> >  crypto/cryptd.c         |    1 +
> >  include/linux/freezer.h |    3 +++
> >  kernel/power/process.c  |    2 +-
> >  3 files changed, 5 insertions(+), 1 deletion(-)
> > diff -ruNp 991-fix-cryptd.patch-old/crypto/cryptd.c
> > 991-fix-cryptd.patch-new/crypto/cryptd.c ---
> > 991-fix-cryptd.patch-old/crypto/cryptd.c	2007-05-19 18:16:47.000000000
> > +1000 +++ 991-fix-cryptd.patch-new/crypto/cryptd.c	2007-05-26
> > 19:45:42.000000000 +1000 @@ -341,6 +341,7 @@ static int cryptd_thread(void
> > *data)
> >
> >  		mutex_unlock(&state->mutex);
> >
> > +		try_to_freeze();
> >  		schedule();
> >  	} while (!stop);
> 
> I tried your patch, but when I apply it my kernel doesn't compile any more. I 
> get these warnings/errors:
> 
> [...]
>   CC      crypto/cryptd.o
> crypto/cryptd.c: In function ‘cryptd_thread’:
> crypto/cryptd.c:344: warning: implicit declaration of function ‘try_to_freeze’
> [...]
>   LD      init/built-in.o
>   LD      .tmp_vmlinux1
> crypto/built-in.o: In function `cryptd_thread':
> cryptd.c:(.text+0xd7f5): undefined reference to `try_to_freeze'
> make: *** [.tmp_vmlinux1] Error 1

Ah. You'll need to add #include <linux/freezer.h> near that start of
crypto/cryptd.c. Sorry for forgetting that.

Nigel

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