linux-kernel - Re: [PATCH 0/2] mmc: rtsx: fix incorrect last byte in R2 response

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Date:	Tue, 26 Aug 2014 19:00:10 -0700
From:	rh_ <richard_hubbe11@...abit.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] mmc: rtsx: fix incorrect last byte in R2 response

On Fri, 15 Aug 2014 14:05:59 +0800
<rogerable@...ltek.com> wrote:

> From: Roger Tseng <rogerable@...ltek.com>
> 
> (The original patch for PCI and USB was splitted here to make it
> easier for stable tree.)
> 
> Current code erroneously fill the last byte of R2 response with an
> undefined value. In addition, the controller actually 'offloads' the
> last byte (CRC7, end bit) while receiving R2 response and thus it's
> impossible to get the actual value. This could cause mmc stack to
> obtain inconsistent CID from the same card after resume and
> misidentify it as a different card.

What does "resume" mean in this context?  Good to see this was
finally fixed. This problem has caused copious log messages regarding
hotplug events and I don't have any debug or extra logging enabled.

I don't know what triggered the message to get logged as my system
doesn't suspend/resume so I wonder what in your investigation makes
you believe this is a symptom of "resume".


> 
> Fix by assigning dummy CRC and end bit: {7'b0, 1} = 0x1 to the last
> byte of R2.
> 
> Roger Tseng (2):
>   mmc: rtsx_pci_sdmmc: fix incorrect last byte in R2 response
>   mmc: rtsx_usb_sdmmc: fix incorrect last byte in R2 response
> 
>  drivers/mmc/host/rtsx_pci_sdmmc.c |    7 +++++++
>  drivers/mmc/host/rtsx_usb_sdmmc.c |    7 +++++++
>  2 files changed, 14 insertions(+)
> 
> -- 
> 1.7.10.4


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