Re: [PATCH v2 1/2] platform/chrome: straighten out cros_ec_get_{next,host}_event() error codes

[Lee Jones <lee.jones@linaro.org>]

On Wed, 07 Nov 2018, Brian Norris wrote:

> cros_ec_get_next_event() is documented to return 0 for success and
> negative for errors. It currently returns negative for some errors, and
> non-negative (number of bytes received) for success (including some "no
> data available" responses as zero). This mostly works out OK, because the
> callers were more or less ignoring the documentation, and only treating
> positive values as success (and indepdently checking the modification of
> 'wakeup').
> 
> Let's button this up by avoiding pretending to handle event/wakeup
> distinctions when no event info was retrieved (i.e., returned 0 bytes).
> And fix the documentation of cros_ec_get_host_event() and
> cros_ec_get_next_event() to accurately describe their behavior.
> 
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
> v1 -> v2:
>  * don't make as many changes to the API -- just fix the documentation
>    and a few corner cases instead
> ---
>  drivers/platform/chrome/cros_ec_proto.c | 4 ++--
>  include/linux/mfd/cros_ec.h             | 6 ++++--
>  2 files changed, 6 insertions(+), 4 deletions(-)

Acked-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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