linux-kernel - Re: [I2C] About warning 'DMA-API: device driver maps memory from stack'

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Message-ID: <20170902215829.3jpwmbyy27cpu5rm@ninjato>
Date:   Sat, 2 Sep 2017 23:58:30 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Jun Gao <jun.gao@...iatek.com>
Cc:     srv_heupstream@...iatek.com, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, yingjoe.chen@...iatek.com
Subject: Re: [I2C] About warning 'DMA-API: device driver maps memory from
 stack'

Hi,

nice to see someone else interested in the I2C & DMA topic.

Please check this series which I sent out recently:

"[RFC PATCH v4 0/6] i2c: document DMA handling and add helpers for it"

In that series, I proposed...

> 3. kmalloc data buffer instead of local variables buf in function
> i2c_smbus_xfer_emulated(...)

... this solution. Although I have to check Mauro's general response to
the series first. I'd be interested in what you think of the series,
too.

Kind regards,

   Wolfram


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