linux-kernel - Re: [PATCH 1/5] i2c: smbus: add unlocked __i2c_smbus

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Message-ID: <20180626134606.h4ciolw23t6qnrjb@ninjato>
Date:   Tue, 26 Jun 2018 17:46:07 +0400
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org,
        Vadim Pasternak <vadimp@...lanox.com>,
        Michael Shych <michaelsh@...lanox.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Jean Delvare <jdelvare@...e.com>, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/5] i2c: smbus: add unlocked __i2c_smbus_xfer variant


> I don't think it's that easy as I just thought about another problem
> with lifting the locking from the emulation function. It calls
> kzalloc(..., GFP_KERNEL), at least in some cases, and that's not a
> very good idea from atomic/irq context...

Right. However, we could simply bail out early when we are in atomic
context. Simply no DMA then...


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