On Thu, Oct 10, 2019 at 8:17 PM Benjamin Tissoires
<benjamin.tissoires@xxxxxxxxxx> wrote:
>
> On Thu, Oct 10, 2019 at 5:19 AM Candle Sun <candlesea@xxxxxxxxx> wrote:
> >
> > On Thu, Oct 10, 2019 at 2:00 AM Jiri Kosina <jikos@xxxxxxxxxx> wrote:
> > >
> > > On Wed, 9 Oct 2019, Nicolas Saenz Julienne wrote:
> > >
> > > > > diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> > > > > index 3eaee2c..3394222 100644
> > > > > --- a/drivers/hid/hid-core.c
> > > > > +++ b/drivers/hid/hid-core.c
> > > > > @@ -35,6 +35,8 @@
> > > > >
> > > > > #include "hid-ids.h"
> > > > >
> > > > > +#define GET_COMPLETE_USAGE(page, id) (((page) << 16) + ((id) & 0xffff))
> > > >
> > > > Not sure I like the macro. I'd rather have the explicit code. That said, lets
> > > > see what Benjamin has to say.
> > >
> > > Not sure about Benjamin :) but I personally would ask for putting it
> > > somewhere into hid.h as static inline.
> > >
> > > And even if it's for some reason insisted on this staying macro, please at
> > > least put it as close to the place(s) it's being used as possible, in
> > > order to maintain some code sanity.
> > >
> > > Thanks,
> > >
> > > --
> > > Jiri Kosina
> > > SUSE Labs
> > >
> >
> > Thanks Nicolas and Jiri,
> > If macro is not good, I will change it to static function. But the
> > funciton is only used in hid-core.c,
> > maybe placing it into hid.h is not good?
>
> I would rather use a function too (in hid-core.c, as it's not reused
> anywhere else), and we can make it simpler from the caller point of
> view (if I am not mistaken):
> ---
> static void concatenate_usage_page(struct hid_parser *parser, int index)
> {
> parser->local.usage[index] &= 0xFFFF;
> parser->local.usage[index] |= (parser->global.usage_page & 0xFFFF) << 16;
> }
>
> // Which can then be called as:
> + parser->local.usage[parser->local.usage_index] = usage;
> + if (size <= 2)
> + concatenate_usage_page(parser, parser->local.usage_index);
> +
>
> // And
> for (i = 0; i < parser->local.usage_index; i++)
> - if (parser->local.usage_size[i] <= 2)
> - parser->local.usage[i] +=
> parser->global.usage_page << 16;
> + if (parser->local.usage_size[i] <= 2) {
> + concatenate_usage_page(parser, i);
> + }
> }
> ---
>
> And now that I have written this, the check on the size could also be
> very well integrated in concatenate_usage_page().
>
> Cheers,
> Benjamin
>
Thanks Benjamin's detailed directions. I will amend the patch.
Candle
> >
> > Regards,
> > Candle
>
