linux-kernel - RE: [PATCH v10 3/3] i2c: imx: add DMA support for freescale i2c driver

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Date:	Tue, 18 Nov 2014 06:56:27 +0000
From:	Yao Yuan <yao.yuan@...escale.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	"marex@...x.de" <marex@...x.de>,
	"LW@...O-electronics.de" <LW@...O-electronics.de>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"fugang.duan@...escale.com" <fugang.duan@...escale.com>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: RE: [PATCH v10 3/3] i2c: imx: add DMA support for freescale i2c
 driver

Hi Wolfram,

Thank you for having found the bug, I indeed missed initializing it('orig_jiffies'). 
I will do more detailed review and send the v11 soon.

Best Regards,
Yuan Yao

> -----Original Message-----
> From: Wolfram Sang [mailto:wsa@...-dreams.de]
> Sent: Tuesday, November 18, 2014 2:24 AM
> To: Yuan Yao-B46683
> Cc: marex@...x.de; LW@...O-electronics.de; mark.rutland@....com; Duan
> Fugang-B38611; shawn.guo@...aro.org; linux-kernel@...r.kernel.org; linux-
> arm-kernel@...ts.infradead.org; linux-i2c@...r.kernel.org
> Subject: Re: [PATCH v10 3/3] i2c: imx: add DMA support for freescale i2c
> driver
> 
> On Mon, Nov 17, 2014 at 06:40:36PM +0800, Yuan Yao wrote:
> > Add dma support for i2c. This function depend on DMA driver.
> > You can turn on it by write both the dmas and dma-name properties in
> dts node.
> > DMA is optional, even DMA request unsuccessfully, i2c can also work
> well.
> >
> > Signed-off-by: Yuan Yao <yao.yuan@...escale.com>
> 
> gcc found a bug:
> 
> drivers/i2c/busses/i2c-imx.c:703:7: warning: 'orig_jiffies' may be used
> uninitialized in this function [-Wuninitialized]
> drivers/i2c/busses/i2c-imx.c:672:16: note: 'orig_jiffies' was declared
> here
> 
> > +	result = wait_for_completion_interruptible_timeout(
> > +				&i2c_imx->dma->cmd_complete,
> > +				msecs_to_jiffies(DMA_TIMEOUT));
> 
> And are you sure you want to use
> wait_for_completion_interruptible_timeout() instead of
> wait_for_completion_timeout() here? Unless you confirm you tested it a
> lot with signals, I really cannot recommend the *_interruptible_* version.
> 
> Other than that, good. I liked the logfile of what you tested very much!
> 
> Thanks,
> 
>    Wolfram

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