From mboxrd@z Thu Jan  1 00:00:00 1970
From: Brian Norris <computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 2/3] MTD: spi-nor: check for short writes in spi_nor_write.
Date: Fri, 22 May 2015 00:25:05 -0700
Message-ID: <20150522072505.GE23718@brian-ubuntu>
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Cc: Michal Suchanek <hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
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To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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(trimming CC a little this time, though it's still a bit large)

On Fri, May 22, 2015 at 12:17:27AM -0700, Brian Norris wrote:
> Admittedly, as he's using an out-of-tree driver, I'm not
> sure I know exactly what failure modes he is hitting yet.

Sorry, I realized I misread here. He's using spi-sunxi. Given that...

... is this code even valid?

static int sun6i_spi_transfer_one(struct spi_master *master,
                                  struct spi_device *spi,
                                  struct spi_transfer *tfr)
{
...
	/* We don't support transfer larger than the FIFO */
	if (tfr->len > SUN6I_FIFO_DEPTH)
		return -EINVAL;

Seems like it should be looping over the transfer in multiple chunks
instead.

Brian