linux-kernel - Re: [PATCH v6 02/10] usb: dwc3: omap: Make the wrapper interrupt shared

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Date:	Mon, 11 Apr 2016 16:15:33 +0300
From:	Roger Quadros <rogerq@...com>
To:	Felipe Balbi <balbi@...nel.org>
CC:	<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
	<sergei.shtylyov@...entembedded.com>, <peter.chen@...escale.com>,
	<jun.li@...escale.com>, <grygorii.strashko@...com>,
	<yoshihiro.shimoda.uh@...esas.com>, <nsekhar@...com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v6 02/10] usb: dwc3: omap: Make the wrapper interrupt
 shared

On 11/04/16 15:58, Felipe Balbi wrote:
> 
> Hi,
> 
> Roger Quadros <rogerq@...com> writes:
>>>> diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
>>>> index 22e9606..51ca098 100644
>>>> --- a/drivers/usb/dwc3/dwc3-omap.c
>>>> +++ b/drivers/usb/dwc3/dwc3-omap.c
>>>> @@ -274,19 +274,25 @@ static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
>>>>  {
>>>>  	struct dwc3_omap	*omap = _omap;
>>>>  	u32			reg;
>>>> +	int			ret = IRQ_NONE;
>>>>  
>>>>  	reg = dwc3_omap_read_irqmisc_status(omap);
>>>>  
>>>> +	if (reg)
>>>> +		ret = IRQ_HANDLED;
>>>
>>> you can avoid the local variable by returning early here.
>>
>> How can we return early? we need to check irq0_status as well right?
> 
> Oh, that's true.
> 
> There's one thing that I noticed though. dma_status is only written to,
> never read, so you should be able to remove it completely (a bit
> off-topic, sorry).
> 
I'll send a patch for that. Can it go in -rc as well along with the other 2?

cheers,
-roger