linux-kernel - Re: [PATCH 1/2] drivers: usb: gadget: udc: add missing break in switch

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Date:   Wed, 08 Feb 2017 14:05:35 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     gregkh@...uxfoundation.org, bhumirks@...il.com, mina86@...a86.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drivers: usb: gadget: udc: add missing break in switch


Hi,

"Gustavo A. R. Silva" <garsilva@...eddedor.com> writes:
>> "Gustavo A. R. Silva" <garsilva@...eddedor.com> writes:
>>> Add missing break in switch.
>>>
>>> Addresses-Coverity-ID: 201385
>>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>>> ---
>>>  drivers/usb/gadget/udc/mv_udc_core.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/usb/gadget/udc/mv_udc_core.c  
>>> b/drivers/usb/gadget/udc/mv_udc_core.c
>>> index 27ebb0d..56b3574 100644
>>> --- a/drivers/usb/gadget/udc/mv_udc_core.c
>>> +++ b/drivers/usb/gadget/udc/mv_udc_core.c
>>> @@ -489,6 +489,7 @@ static int mv_ep_enable(struct usb_ep *_ep,
>>>  		break;
>>>  	case USB_ENDPOINT_XFER_CONTROL:
>>>  		ios = 1;
>>> +		break;
>>
>> are you SURE this is supposed to have this break statement? What if we
>> want to initialize mult to 0 *also* for control endpoints? How did you
>> test this? Do you have access to Marvel's documentation for this
>> controller?
>>
>
> Certainly I wasn't sure, but I also think this is kind of obscure  
> code. If that is the case that we also want to initialize mult to 0,  
> wouldn't it be clearer (for maintenance purposes) to add mult = 0 and  
> the break statement after ios = 1?
>
> What do you think if I modify that piece of code as follows:

I think you need to test it, or get someone to test it for you :-)

-- 
balbi

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