linux-kernel - Re: [PATCH] i8k: Fix temperature bug handling in i8k_get

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Date:	Sun, 30 Nov 2014 17:00:36 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Steven Honeyman <stevenhoneyman@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i8k: Fix temperature bug handling in i8k_get_temp()

On Sunday 30 November 2014 16:56:32 Guenter Roeck wrote:
> On 11/30/2014 06:48 AM, Pali Rohár wrote:
> [ ... ]
> 
> >>> +	if (temp > I8K_MAX_TEMP)
> >>> +		return -ERANGE;
> >> 
> >> Can we return -ENODATA in this case ? I think that would be
> >> more appropriate.
> > 
> > This is internal kernel function, no problem. If you prefer
> > NODATA instead RANGE I will change it.
> 
> The idea was to return ENODATA to user space (see below).
> 
> >>>    #endif
> >>>    
> >>>    	return temp;
> >>> 
> >>> @@ -499,6 +501,8 @@ static ssize_t
> >>> i8k_hwmon_show_temp(struct device *dev,
> >>> 
> >>>    	int temp;
> >>>    	
> >>>    	temp = i8k_get_temp(index);
> >>> 
> >>> +	if (temp == -ERANGE)
> >>> +		return -EINVAL;
> >> 
> >> and can we also return -ENODATA to user space ?
> >> This would make the code a bit cleaner.
> >> 
> >> Thanks,
> >> Guenter
> > 
> > There was some problems when I tested similar patch for
> > radeon.ko (do not report temperature to userspace when card
> > is turned off).
> 
> You mean when returning -ENODATA to user space ?
> I tested that; it worked for me and does what we want it to do
> (the sensors command to displays N/A). This would avoid having
> to change -ERANGE to a different error code above.
> 
> Guenter

Now I tested it too on Ubuntu and it working. sensors display N/A 
without error message. So I will change code.

-- 
Pali Rohár
pali.rohar@...il.com

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