linux-kernel - Re: [PATCH v4 0/7] Add spi-nor SPI transfer error handling

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Message-ID: <20151119234323.GO64635@google.com>
Date:	Thu, 19 Nov 2015 15:43:23 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Hou Zhiqiang <B48286@...escale.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Han Xu <han.xu@...escale.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Marek Vasut <marex@...x.de>, Gabor Juhos <juhosg@...nwrt.org>,
	Bean Huo 霍斌斌, <beanhuo@...ron.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Heiner Kallweit <hkallweit1@...il.com>,
	Huang Shijie <shijie.huang@....com>
Subject: Re: [PATCH v4 0/7] Add spi-nor SPI transfer error handling

Hi Michal,

On Fri, Aug 14, 2015 at 09:23:06AM -0000, Michal Suchanek wrote:
> Hello,
> 
> with these patches SPI transfer errors are not silently ignored but rather
> reported to spi-nor users.
> 
> This should prevent silently dropping data to the floor in cases when the SPI
> transfer fails and the failure is detected.
> 
> It has been pointed out that MTD users do not handle the case when data is read
> only partially so this version adds the last patch which handles this in
> spi-nor.
> 
> Thanks
> 
> Michal
> 
> Michal Suchanek (7):
>   mtd: spi-nor: change return value of read/write
>   mtd: m25p80: return amount of data transferred or error in read/write
>   mtd: fsl-quadspi: return amount of data read/written or error
>   mtd: spi-nor: check return value from read/write
>   mtd: spi-nor: stop passing around retlen

Patches 1 to 5 look good to me, though there is a new spi-nor driver
since you sent this. Can you rebase/fixup?

>   mtd: spi-nor: simplify write loop
>   mtd: spi-nor: add read loop

I posted some comments for these. I get the feeling that patch 6 is
over-complicated and should be just a simple assertion. And I'm still
not 100% sure on the approach for patch 7, since it's not clear whether
the responsibility lies in the SPI layer or in MTD.

Brian

>  drivers/mtd/devices/m25p80.c      | 33 +++++++++------
>  drivers/mtd/spi-nor/fsl-quadspi.c | 29 ++++++-------
>  drivers/mtd/spi-nor/spi-nor.c     | 85 +++++++++++++++++++++++----------------
>  include/linux/mtd/spi-nor.h       |  8 ++--
>  4 files changed, 91 insertions(+), 64 deletions(-)
> 
> -- 
> 2.1.4
> 
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