linux-kernel - Re: [PATCH v2] dmi: Make dmi_walk and dmi_walk

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Date:   Tue, 6 Jun 2017 16:52:29 +0200
From:   Jean Delvare <jdelvare@...e.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] dmi: Make dmi_walk and dmi_walk_early return real
 error codes

On Sat, 3 Jun 2017 11:05:00 -0700, Andy Lutomirski wrote:
> Currently they return -1 on error, which will confuse callers if
> they try to interpret it as a normal negative error code.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> Cc: Jean Delvare <jdelvare@...e.com>
> Signed-off-by: Darren Hart (VMware) <dvhart@...radead.org>
> ---
> since v1: Use ENXIO instead of ENOENT in the !dmi_available condition
> 
>  drivers/firmware/dmi_scan.c | 9 +++++----
>  include/linux/dmi.h         | 2 +-
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
> index 54be60e..cfe0d9d 100644
> --- a/drivers/firmware/dmi_scan.c
> +++ b/drivers/firmware/dmi_scan.c
> @@ -144,7 +144,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
>  
>  	buf = dmi_early_remap(dmi_base, orig_dmi_len);
>  	if (buf == NULL)
> -		return -1;
> +		return -ENOMEM;
>  
>  	dmi_decode_table(buf, decode, NULL);
>  
> @@ -992,7 +992,8 @@ EXPORT_SYMBOL(dmi_get_date);
>   *	@decode: Callback function
>   *	@private_data: Private data to be passed to the callback function
>   *
> - *	Returns -1 when the DMI table can't be reached, 0 on success.
> + *	Returns 0 on success, -ENXIO if DMI is not selected or not present,
> + *	or a different negative error code if DMI walking fails.
>   */
>  int dmi_walk(void (*decode)(const struct dmi_header *, void *),
>  	     void *private_data)
> @@ -1000,11 +1001,11 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
>  	u8 *buf;
>  
>  	if (!dmi_available)
> -		return -1;
> +		return -ENXIO;
>  
>  	buf = dmi_remap(dmi_base, dmi_len);
>  	if (buf == NULL)
> -		return -1;
> +		return -ENOMEM;
>  
>  	dmi_decode_table(buf, decode, private_data);
>  
> diff --git a/include/linux/dmi.h b/include/linux/dmi.h
> index 5e9c74c..9bbf21a 100644
> --- a/include/linux/dmi.h
> +++ b/include/linux/dmi.h
> @@ -136,7 +136,7 @@ static inline int dmi_name_in_vendors(const char *s) { return 0; }
>  static inline int dmi_name_in_serial(const char *s) { return 0; }
>  #define dmi_available 0
>  static inline int dmi_walk(void (*decode)(const struct dmi_header *, void *),
> -	void *private_data) { return -1; }
> +	void *private_data) { return -ENXIO; }
>  static inline bool dmi_match(enum dmi_field f, const char *str)
>  	{ return false; }
>  static inline void dmi_memdev_name(u16 handle, const char **bank,

Applied, thanks.

-- 
Jean Delvare
SUSE L3 Support