linux-kernel - Re: touchscreen: edt-ft5x06: Prevent DMA driver from mapping an area on stack

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Message-ID: <20151214075339.GA28733@Sanchayan-Arch.toradex.int>
Date:	Mon, 14 Dec 2015 13:23:39 +0530
From:	maitysanchayan@...il.com
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-input@...r.kernel.org,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	maxime.ripard@...e-electrons.com, stefan@...er.ch
Subject: Re: touchscreen: edt-ft5x06: Prevent DMA driver from mapping an area
 on stack

Hello,

On 15-12-12 20:42:37, Dmitry Torokhov wrote:
> On Sat, Dec 12, 2015 at 06:13:55PM +0100, Wolfram Sang wrote:
> > 
> > > Frankly speaking I do not know where the fix should actually be. I2C IMX
> > > driver somehow taking care of this or the users of I2C, touchscreen drivers
> > > in this case. In my opinion, the fix should be with the touchscreen driver
> > > however I did like to have feedback or hear opinions on what is the accepted
> > > solution to this.
> > 
> > There is no accepted solution to this yet :( DMA is/was still too rare for
> > a serious discussion about this. There is also [1] and probably more...
> > 
> > [1]  http://patchwork.ozlabs.org/patch/220137/
> 
> I believe vast majority of i2c client drivers do not expect that the
> transfer buffer they supply in i2c messages are supposed to be DMAable
> (unlike USB and SPI buses that had that requirement from the beginning).
> 
> I won't be applying this patch unless we decide that I2C changes the
> rules.

Understood. Thanks for the clarifications Dmitry and Wolfram.

- Sanchayan.
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