On Tue, Apr 15, 2014 at 05:57:39PM +0800, Barry Song wrote:
> 2014-04-15 17:26 GMT+08:00 Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>:

> > OK, that needs fixing.  That code predates anyone doing DMA.

> if it is out of specification, it seems fixing spidev.c is not enough
> as spi transfer actually needs an precondition of tx!=rx now.

Well, it's enough to avoid bugs.  Adding the validation to make sure
nobody introduces the problem again is nice too but isn't as urgent.