From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH 1/7] spi: core: Validate Tx/Rx buffers for non-zero
 length transfer
Date: Sat, 16 Aug 2014 15:34:01 +0100
Message-ID: <20140816143401.GO28623@sirena.org.uk>
References: <1395201227.16346.1.camel@phoenix>
 <CAMuHMdWCdp_SW5CNt50cSfG700JRU3tr=Pbyhv8nv-1Ve=XUNw@mail.gmail.com>
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Cc: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>,
	Wenyou Yang <wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
	Fabrice Crohas <fcrohas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Illia Smyrnov <illia.smyrnov-hExfYMNmJl/Cnp4W7fqMDg@public.gmane.org>,
	Atsushi Nemoto <anemo-7JcRY8pycbNHfZP73Gtkiw@public.gmane.org>,
	Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>,
	linux-spi <linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
To: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
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On Wed, Mar 19, 2014 at 09:06:31AM +0100, Geert Uytterhoeven wrote:
> On Wed, Mar 19, 2014 at 4:53 AM, Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org> wrote:

> > Reject transfer if both tx_buf and rx_buf are NULL for non-zero length transfer.
> > Add the checking in spi core so we can remove the same checking in various
> > drivers.

> Just wondering: are there any SPI slave drivers that implement dummy cycles
> this way?

The ChromeOS EC apparently does this.

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