linux-kernel - Re: [PATCH] spi: Clarify (a)synchronous transfer

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Date:	Tue, 14 Jan 2014 14:36:27 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Subject: Re: [PATCH] spi: Clarify (a)synchronous transfer_one()

On Tue, Jan 14, 2014 at 12:34:56PM +0100, Geert Uytterhoeven wrote:

> + * @transfer_one: transfer a single spi_transfer.
> + *                Synchronous transfer methods must return 0 on success.
> + *                Asynchronous transfer methods must return a strict-positive
> + *                value on successful submission, and must call
> + *                spi_finalize_current_transfer() when the driver is finished
> + *                so the subsystem can issue the next transfer

This is hard to understand, I'd not expect people not comfortable with
English to readily follow what it means.  Things like "strict-positive"
aren't common outside of mathematics and I myself had to think what an
asynchronous transfer_one() meant.  Something along the lines of "return
0 if the trasfer is finished or a positive number if the transfer is in
progress and finalize will be called later" would be more readily
comprehensible.  If you're concerned about positive just specify 1.

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