linux-kernel - Re: [PATCH] tpm: fix tpm_bios_log

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Date:	Wed, 16 Mar 2016 12:13:41 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	"Hon Ching (Vicky) Lo" <honclo@...ux.vnet.ibm.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tpm: fix tpm_bios_log_setup stub prototype

On Wed, Mar 16, 2016 at 09:19:48AM +0100, Arnd Bergmann wrote:
> A cleanup patch changed the prototype of the regular tpm_bios_log_setup
> function, but not that of the stub that is used when the TPM is disabled,
> causing a harmless build warning:
> 
> drivers/char/tpm/tpm-chip.c: In function 'tpm1_chip_register':
> drivers/char/tpm/tpm-chip.c:287:38: error: passing argument 1 of 'tpm_bios_log_setup' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
>   chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev));
> In file included from ../drivers/char/tpm/tpm-chip.c:30:0:
> ../drivers/char/tpm/tpm_eventlog.h:83:31: note: expected 'char *' but argument is of type 'const char *'
>  static inline struct dentry **tpm_bios_log_setup(char *name)
> 
> This changes the stub function to match the normal prototype,
> avoiding that warning.

Good catch. Thank you.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: aca8db8088c3 ("tpm: Get rid of devname")
> ---
>  drivers/char/tpm/tpm_eventlog.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
> index cc9672f64e8f..8de62b09be51 100644
> --- a/drivers/char/tpm/tpm_eventlog.h
> +++ b/drivers/char/tpm/tpm_eventlog.h
> @@ -80,7 +80,7 @@ int read_log(struct tpm_bios_log *log);
>  extern struct dentry **tpm_bios_log_setup(const char *);
>  extern void tpm_bios_log_teardown(struct dentry **);
>  #else
> -static inline struct dentry **tpm_bios_log_setup(char *name)
> +static inline struct dentry **tpm_bios_log_setup(const char *name)
>  {
>  	return NULL;
>  }
> -- 
> 2.7.0

/Jarkko