linux-kernel - Re: [PATCH 2/3] MTD: spi-nor: check for short writes in spi_nor

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Message-ID: <20150522072505.GE23718@brian-ubuntu>
Date:	Fri, 22 May 2015 00:25:05 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Michal Suchanek <hramrach@...il.com>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Marek Vasut <marex@...x.de>,
	Rafał Miłecki <zajec5@...il.com>,
	Alison Chaiken <alison_chaiken@...tor.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH 2/3] MTD: spi-nor: check for short writes in
 spi_nor_write.

(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
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