linux-kernel - Re: [tpmdd-devel] [PATCH] - TPM save state before suspending to ram

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Date:	Sat, 5 Jan 2008 00:44:13 +0100
From:	Pavel Machek <pavel@....cz>
To:	Kent Yoder <shpedoikal@...il.com>
Cc:	Marcel Selhorst <tpm@...horst.net>, Andrew Morton <akpm@...l.org>,
	TPM Device Driver List <tpmdd-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, David Smith <davidsmith@....org>
Subject: Re: [tpmdd-devel] [PATCH] - TPM save state before suspending to ram

On Fri 2008-01-04 14:09:01, Kent Yoder wrote:
> On Jan 4, 2008 10:39 AM, Pavel Machek <pavel@....cz> wrote:
> >
> > On Thu 2008-01-03 21:44:15, Marcel Selhorst wrote:
> > > Dear list,
> > >
> > > this patch fixes a bug, that prevents the TPM chip to resume correctly from a
> > > suspended state.
> > >
> > > Signed-off-by: Marcel Selhorst <tpm@...horst.net>
> [cut]
> >
> > I'm not sure if we want to use variable-size array on stack. What
> > hacks are you doing with max_t/max?
> >                                                                         Pavel
> 
> Hi Pavel,
> 
>   Here's an alternate solution from David, signoffs pending --
> 
> commit 058f1e3c4d4e2de5a7188608a1c2e0722498fd4b
> Author: David Smith <davidsmith@....org>
> Date:   Fri Jan 4 03:33:11 2008 +0900
> 
>     Fix for TPM suspend/resume failure
> 
> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
> index 9bb5429..79d2fd5 100644
> --- a/drivers/char/tpm/tpm.c
> +++ b/drivers/char/tpm/tpm.c
> @@ -1046,12 +1046,6 @@ void tpm_remove_hardware(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(tpm_remove_hardware);
> 
> -static u8 savestate[] = {
> -	0, 193,			/* TPM_TAG_RQU_COMMAND */
> -	0, 0, 0, 10,		/* blob length (in bytes) */
> -	0, 0, 0, 152		/* TPM_ORD_SaveState */
> -};
> -
>  /*
>   * We are about to suspend. Save the TPM state
>   * so that it can be restored.
> @@ -1059,8 +1053,14 @@ static u8 savestate[] = {
>  int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
>  {
>  	struct tpm_chip *chip = dev_get_drvdata(dev);
> +        u8 savestate[] = {
> +          0, 193,		/* TPM_TAG_RQU_COMMAND */
> +          0, 0, 0, 10,		/* blob length (in bytes) */
> +          0, 0, 0, 152		/* TPM_ORD_SaveState */
> +        };
> +
>  	if (chip == NULL)
> -		return -ENODEV;
> +          return -ENODEV;
> 
>  	tpm_transmit(chip, savestate, sizeof(savestate));
>  	return 0;

Yep, but please fix the whitespace.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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