On Sun, 2021-04-11 at 14:56 +0100, Jonathan Cameron wrote:
> On Fri, 09 Apr 2021 11:19:12 -0700
> Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> wrote:
>
> > On Fri, 2021-04-09 at 15:15 +0800, Jiapeng Chong wrote:
> > > Fix the following gcc warning:
> > >
> > > drivers/hid/hid-sensor-custom.c:400:7: warning: variable ‘ret’
> > > set
> > > but
> > > not used [-Wunused-but-set-variable].
> > >
> > > Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
> > > Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
> > Acked-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx
>
> Perhaps better to return ret if it is non zero?
> I can't immediately figure out if there is a reason we know that
> can't
> happen.
Only time it can fail when there is no report descriptor or the field
index is >= report->maxfield.
But since the attribute is registered from the report descriptor and
index, this can't happen.
But we can enhance sensor_hub_set_feature() to fail when
hid_set_field() fails. There is one case where field->logical_minimum
< 0 and value is out of range.
Thanks,
Srinivas
>
> Jonathan
>
> > > ---
> > > drivers/hid/hid-sensor-custom.c | 5 ++---
> > > 1 file changed, 2 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-
> > > sensor-custom.c
> > > index 2628bc5..e430673 100644
> > > --- a/drivers/hid/hid-sensor-custom.c
> > > +++ b/drivers/hid/hid-sensor-custom.c
> > > @@ -397,15 +397,14 @@ static ssize_t store_value(struct device
> > > *dev,
> > > struct device_attribute *attr,
> > >
> > > if (!strncmp(name, "value", strlen("value"))) {
> > > u32 report_id;
> > > - int ret;
> > >
> > > if (kstrtoint(buf, 0, &value) != 0)
> > > return -EINVAL;
> > >
> > > report_id = sensor_inst->fields[field_index].attribute.
> > > report_
> > > id;
> > > - ret = sensor_hub_set_feature(sensor_inst->hsdev,
> > > report_id,
> > > - index, sizeof(value),
> > > &value);
> > > + sensor_hub_set_feature(sensor_inst->hsdev, report_id,
> > > index,
> > > + sizeof(value), &value);
> > > } else
> > > return -EINVAL;
> > >
