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Date: Tue, 11 Apr 2017 10:18:08 +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 v2 1/5] mfd: cros-ec: Fix host command buffer size On Mon, 03 Apr 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@...labora.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. > > Changes since v1: > - None > > include/linux/mfd/cros_ec.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) This patch is already in Mainline. > 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 Follow Linaro: Facebook | Twitter | Blog
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