linux-kernel - Re: [PATCH v2] tpm: Fix suspend regression

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Message-ID: <20160512134952.GA13575@intel.com>
Date:	Thu, 12 May 2016 16:49:53 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, jmmahler@...il.com,
	jgunthorpe@...idianresearch.com,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tpm: Fix suspend regression

On Wed, May 11, 2016 at 11:28:27AM -0400, Stefan Berger wrote:
> Fix the suspend regression due to the wrong way of retrieving the
> chip structure. The suspend functions are attached to the hardware
> device, not the chip and thus must rely on drvdata.
> 
> Fixes: e89f8b1ade9cc1a ("tpm: Remove all uses of drvdata from the TPM Core")
> Reported-by: Jeremiah Mahler <jmmahler@...il.com>
> Signed-off-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
> Tested-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
> Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Tested-by: Jeremiah Mahler <jmmahler@...il.com>

Acked-by: Jarkko Sakkinen <jarkko.sakkine@...ux.intel.com>

/Jarkko

> ---
>  drivers/char/tpm/tpm-interface.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 080dade..5e3c1b6 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -934,7 +934,7 @@ static struct tpm_input_header savestate_header = {
>   */
>  int tpm_pm_suspend(struct device *dev)
>  {
> -	struct tpm_chip *chip = to_tpm_chip(dev);
> +	struct tpm_chip *chip = dev_get_drvdata(dev);
>  	struct tpm_cmd_t cmd;
>  	int rc, try;
>  
> @@ -995,7 +995,7 @@ EXPORT_SYMBOL_GPL(tpm_pm_suspend);
>   */
>  int tpm_pm_resume(struct device *dev)
>  {
> -	struct tpm_chip *chip = to_tpm_chip(dev);
> +	struct tpm_chip *chip = dev_get_drvdata(dev);
>  
>  	if (chip == NULL)
>  		return -ENODEV;
> -- 
> 2.4.3
>