linux-kernel - Re: [PATCH V8 04/10] USB: f81232: implement read IIR/MSR with endpoint

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Date:	Mon, 16 Mar 2015 11:08:29 +0800
From:	Peter Hung <hpeter@...il.com>
To:	Johan Hovold <johan@...nel.org>
CC:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom_tsai@...tek.com.tw,
	peter_hong@...tek.com.tw,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V8 04/10] USB: f81232: implement read IIR/MSR with endpoint

Hello,

Johan Hovold 於 2015/3/14 下午 08:02 寫道:
> On Thu, Feb 26, 2015 at 06:02:10PM +0800, Peter Hung wrote:
>> +	if (status != sizeof(*val)) {
>> +		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
>> +
>> +		if (status == 0)
>> +			status = -EIO;
>> +		else
>> +			status = usb_translate_errors(status);
>
> Could you rewrite this as
>
> 	if (status < 0)
> 		status = usb_translate_errors(status);
> 	else
> 		status = 0;

In my definition the return value of set/getregister(), 0 is success, 
negative values are errors. The function usb_control_msg() return value 
is success transmited/received byte. It's maybe return 0. I want to 
treat 0 with error(-EIO). But if pass 0 to usb_translate_errors(), It 
will return 0 back. So I need especially handle with status == 0.

I'll keep this sections.

Thanks for review
-- 
With Best Regards,
Peter Hung
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