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SubjectRe: [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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