linux-kernel - Re: [PATCH v3 18/23] platform/chrome: cros_ec_proto: check `msg->result` in getting cmd mask

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Message-ID: <CABXOdTe_tG2e3MK=d6ZWggjj_=iYn7BFjhGOvOJBJ1JASx3NEw@mail.gmail.com>
Date:   Wed, 8 Jun 2022 09:27:57 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Tzung-Bi Shih <tzungbi@...nel.org>
Cc:     Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        "open list:CHROME HARDWARE PLATFORM SUPPORT" 
        <chrome-platform@...ts.linux.dev>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 18/23] platform/chrome: cros_ec_proto: check
 `msg->result` in getting cmd mask

On Wed, Jun 8, 2022 at 9:23 AM Guenter Roeck <groeck@...gle.com> wrote:
>
> On Wed, Jun 8, 2022 at 4:08 AM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
> >
> > cros_ec_get_host_command_version_mask() should check if EC wasn't happy
> > by checking `msg->result`.
> >
> > Use cros_ec_map_error() and return the error code if any.
> >
> > Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
> > ---
> > No v2.  New and separated from the original series.
> >
> >  drivers/platform/chrome/cros_ec_proto.c | 21 +++++++++++++--------
> >  1 file changed, 13 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> > index 06bc7db1213e..6a5771361383 100644
> > --- a/drivers/platform/chrome/cros_ec_proto.c
> > +++ b/drivers/platform/chrome/cros_ec_proto.c
> > @@ -428,13 +428,12 @@ static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
> >   * the caller has ec_dev->lock mutex or the caller knows there is
> >   * no other command in progress.
> >   */
> > -static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
> > -       u16 cmd, u32 *mask)
> > +static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, u16 cmd, u32 *mask)
> >  {
> >         struct ec_params_get_cmd_versions *pver;
> >         struct ec_response_get_cmd_versions *rver;
> >         struct cros_ec_command *msg;
> > -       int ret;
> > +       int ret, mapped;
> >
> >         msg = kmalloc(sizeof(*msg) + max(sizeof(*rver), sizeof(*pver)),
> >                       GFP_KERNEL);
> > @@ -450,14 +449,20 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
> >         pver->cmd = cmd;
> >
> >         ret = send_command(ec_dev, msg);
> > -       if (ret > 0) {
> > -               rver = (struct ec_response_get_cmd_versions *)msg->data;
> > -               *mask = rver->version_mask;
> > -               ret = 0;
> > +       if (ret < 0)
> > +               goto exit;
> > +
> > +       mapped = cros_ec_map_error(msg->result);
> > +       if (mapped) {
> > +               ret = mapped;
> > +               goto exit;
> >         }
> >
> What if ret == 0 ? Is that valid ?
>

Never mind, addressed in a follow-up patch.

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> Thanks,
> Guenter
>
> > +       rver = (struct ec_response_get_cmd_versions *)msg->data;
> > +       *mask = rver->version_mask;
> > +       ret = 0;
> > +exit:
> >         kfree(msg);
> > -
> >         return ret;
> >  }
> >
> > --
> > 2.36.1.255.ge46751e96f-goog
> >