linux-kernel - Re: RE: [PATCH v3 0/2] usb: Check for DMA capable buffer sanity

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Message-ID: <20170531192355.agnn6qbtdua5lgoy@ninjato>
Date:   Wed, 31 May 2017 21:23:55 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Vignesh R <vigneshr@...com>
Cc:     David Laight <David.Laight@...LAB.COM>,
        Florian Fainelli <f.fainelli@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Peter Chen <peter.chen@....com>, Roger Quadros <rogerq@...com>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Baoyou Xie <baoyou.xie@...aro.org>,
        Sekhar Nori <nsekhar@...com>, William wu <wulf@...k-chips.com>,
        Arnd Bergmann <arnd@...db.de>,
        Chris Bainbridge <chris.bainbridge@...il.com>,
        Wolfram Sang <wsa-dev@...g-engineering.com>,
        Krzysztof Opasiak <k.opasiak@...sung.com>,
        Felix Hädicke <felixhaedicke@....de>,
        Colin Ian King <colin.king@...onical.com>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "clemens@...isch.de" <clemens@...isch.de>,
        "maksim.salau@...il.com" <maksim.salau@...il.com>
Subject: Re: RE: [PATCH v3 0/2] usb: Check for DMA capable buffer sanity


> So, if I2C is a bit different, then it might simply make sense to keep
> the function local for I2C now? This seems like a sensible start to me
> meanwhile.

Then again, the DMA API would be for drivers. If the USB core wants to
check for capable buffers, such a helper might be nice nonetheless.
Especially if the USB core needs the check in at least 3 places.


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