linux-kernel - Re: [PATCH 1/7] mfd: cros-ec: Fix host command buffer size

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Date:   Mon, 3 Apr 2017 15:30:20 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Olof Johansson <olof@...om.net>, bleung@...omium.org,
        martinez.javier@...il.com, Guenter Roeck <groeck@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        rtc-linux@...glegroups.com, Vic Yang <victoryang@...gle.com>
Subject: Re: [PATCH 1/7] mfd: cros-ec: Fix host command buffer size

On Mon, 03 Apr 2017, Lee Jones wrote:

> On Fri, 24 Mar 2017, Enric Balletbo i Serra wrote:
> 
> > From: Vic Yang <victoryang@...gle.com>
> > 
> > For SPI, we can get up to 32 additional bytes for response preamble.
> > The current overhead (2 bytes) may cause problems when we try to receive
> > a big response. Update it to 32 bytes.
> > 
> > Without this fix we could see a kernel BUG when we receive a big response
> > from the Chrome EC when is connected via SPI.
> > 
> > Signed-off-by: Vic Yang <victoryang@...gle.com>
> > Tested-by: Enric Balletbo i Serra <enric.balletbo.collabora.com>
> > ---
> > 
> >   This patch is a FIX, and I think that would be interesting see it merged
> > in this release cycle. This should go through the MFD tree and can be picked
> > independently of the other patches. Lee Jones I think this is for you.
> > 
> >  include/linux/mfd/cros_ec.h | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Applied, thanks.

Scrap that, I'll keep it with the set.

> > diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> > index b3e812f..3b16c90 100644
> > --- a/include/linux/mfd/cros_ec.h
> > +++ b/include/linux/mfd/cros_ec.h
> > @@ -35,10 +35,11 @@
> >   * Max bus-specific overhead incurred by request/responses.
> >   * I2C requires 1 additional byte for requests.
> >   * I2C requires 2 additional bytes for responses.
> > + * SPI requires up to 32 additional bytes for responses.
> >   * */
> >  #define EC_PROTO_VERSION_UNKNOWN	0
> >  #define EC_MAX_REQUEST_OVERHEAD		1
> > -#define EC_MAX_RESPONSE_OVERHEAD	2
> > +#define EC_MAX_RESPONSE_OVERHEAD	32
> >  
> >  /*
> >   * Command interface between EC and AP, for LPC, I2C and SPI interfaces.
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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