linux-kernel - Re: [PATCH 09/10] mfd: cros_ec: Check result code from EC messages

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Message-ID: <20140618073505.GC21030@lee--X1>
Date:	Wed, 18 Jun 2014 08:35:05 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Simon Glass <sjg@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Bill Richardson <wfrichar@...omium.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/10] mfd: cros_ec: Check result code from EC messages

On Tue, 17 Jun 2014, Doug Anderson wrote:

> Simon,
> 
> On Tue, Jun 17, 2014 at 8:43 PM, Simon Glass <sjg@...omium.org> wrote:
> >> diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
> >> index 09ca789..4d34f1c 100644
> >> --- a/drivers/mfd/cros_ec_spi.c
> >> +++ b/drivers/mfd/cros_ec_spi.c
> >> @@ -289,21 +289,23 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
> >>                 goto exit;
> >>         }
> >>
> >> -       /* check response error code */
> >>         ptr = ec_dev->din;
> >> -       if (ptr[0]) {
> >> -               if (ptr[0] == EC_RES_IN_PROGRESS) {
> >> -                       dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> >> -                               ec_msg->command);
> >> -                       ret = -EAGAIN;
> >> -                       goto exit;
> >> -               }
> >> -               dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
> >> -                        ec_msg->command, ptr[0]);
> >> -               debug_packet(ec_dev->dev, "in_err", ptr, len);
> >> -               ret = -EINVAL;
> >> +
> >> +       /* check response error code */
> >> +       ec_msg->result = ptr[0];
> >> +       switch (ec_msg->result) {
> >> +       case EC_RES_SUCCESS:
> >> +               break;
> >> +       case EC_RES_IN_PROGRESS:
> >> +               ret = -EAGAIN;
> >> +               dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> >> +                       ec_msg->command);
> >>                 goto exit;
> >> +       default:
> >> +               dev_warn(ec_dev->dev, "command 0x%02x returned %d\n",
> >> +                        ec_msg->command, ec_msg->result);
> >>         }
> >
> > Since this code is the same as the above, should it go in a common
> > function in cros_ec?
> 
> So you are thinking it should be written like:
> 
> ec_msg->result = ptr[0];
> ret = cros_ec_check_result(ec_dev, ec_msg);
> if (ret)
>   goto exit;
> 
> ---
> 
> int cros_ec_check_result(struct cros_ec_device *ec_dev, struct
> cros_ec_command *ec_msg)
> {
>        switch (ec_msg->result) {
>        case EC_RES_SUCCESS:
>                return 0;
>        case EC_RES_IN_PROGRESS:
>                dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
>                        ec_msg->command);
>                return -EAGAIN;
>        default:
>                dev_warn(ec_dev->dev, "command 0x%02x returned %d\n",
>                         ec_msg->command, ec_msg->result);
>                return 0;
> }
> 
> OK, that seems reasonable.  I'll plan to spin tomorrow with that.

+1

I'll do a proper review when you re-spin the patch.

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