linux-kernel - Re: [PATCH] spi: core: Validate lenght of the transfers in message

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Date:	Fri, 14 Feb 2014 10:16:05 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Gerhard Sittig <gsi@...x.de>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: core: Validate lenght of the transfers in message

On Fri, 2014-02-14 at 00:26 +0000, Mark Brown wrote: 
> On Thu, Feb 13, 2014 at 10:27:57PM +0100, Gerhard Sittig wrote:
> > On Thu, Feb 13, 2014 at 16:46 +0200, Ivan T. Ivanov wrote:
> 
> > > SPI transfer lenght should be a power-of-two multiple
> > > of eight bits.
> 
> > Are you suggesting that an SPI transfer cannot consist of e.g.
> > three bytes?  This would be surprising, and certainly would be
> > rather wrong an assumption.  Am I missing/misunderstanding
> > something?
> 
> The check is supposed to be verifying that the transfer is a whole
> number of the current SPI word size as I understand it (not actually
> looked at the change yet but that's where it came from, factored out of
> a driver).

Yes. Comment is not correct. Is this better?

"SPI transfer length should be multiple of SPI word size, where SPI
word size should be power-of-two multiple"

Regards,
Ivan

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