linux-kernel - Re: [PATCH 1/1] spi: altera: Add empty implementation of setup

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Date:	Thu, 9 Apr 2015 16:40:45 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Pelle Nilsson <per.nilsson@...mo.com>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	nios2-dev@...ts.rocketboards.org
Subject: Re: [PATCH 1/1] spi: altera: Add empty implementation of
 setup_transfer callback

On Thu, Apr 09, 2015 at 05:03:42PM +0200, Pelle Nilsson wrote:

> This callback is mandatory since txrx_bufs callback is defined. The lack of
> it causes a kernel panic on first SPI transaction.

Why is the callback mandatory if an empty implementation is OK?

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