linux-kernel - Re: [PATCH] spi: core: make zero length transfer valid again

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Date:	Mon, 3 Mar 2014 09:26:58 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	Mark Brown <broonie@...nel.org>, iivanov@...sol.com, gsi@...x.de,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: core: make zero length transfer valid again

On Fri, Feb 28, 2014 at 11:03:16PM +0900, Atsushi Nemoto wrote:
> Zero length transfer becomes invalid since
> "spi: core: Validate length of the transfers in message" commit,
> but it should be valid to support an odd device, for example, which
> requires long delay between chipselect and the first transfer, etc.
> 
> Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
> ---
>  drivers/spi/spi.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

This fixes a regression on Venice2, where the keyboard controller relied
on similar behaviour, so even if this is already applied,

Tested-by: Thierry Reding <treding@...dia.com>

Thanks,
Thierry

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