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

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Date:	Sat, 26 May 2007 14:49:09 +0200
From:	Maximilian Engelhardt <maxi@...monizer.de>
To:	nigel@...el.suspend2.net
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

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

Maxi

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