From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: Candle Sun <candlesea@gmail.com>
Cc: Jiri Kosina <jikos@kernel.org>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
orson.zhai@unisoc.com,
"open list:HID CORE LAYER" <linux-input@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Candle Sun <candle.sun@unisoc.com>,
Nianfu Bai <nianfu.bai@unisoc.com>
Subject: Re: [PATCH v2] HID: core: check whether usage page item is after usage id item
Date: Thu, 10 Oct 2019 14:16:47 +0200 [thread overview]
Message-ID: <CAO-hwJJEcP3AEYfadhEbqzfszawxiQ7E9NAwmxHcK6SH8zzhiQ@mail.gmail.com> (raw)
In-Reply-To: <CAPnx3XNGBw+SKSFA3DhhHFZZ17f54DMfYjKOcqYTb3N-PWGKpw@mail.gmail.com>
On Thu, Oct 10, 2019 at 5:19 AM Candle Sun <candlesea@gmail.com> wrote:
>
> On Thu, Oct 10, 2019 at 2:00 AM Jiri Kosina <jikos@kernel.org> 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
>
> Regards,
> Candle
next prev parent reply other threads:[~2019-10-10 12:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 12:53 [PATCH v2] HID: core: check whether usage page item is after usage id item Candle Sun
2019-10-09 17:01 ` Nicolas Saenz Julienne
2019-10-09 17:59 ` Jiri Kosina
2019-10-10 3:19 ` Candle Sun
2019-10-10 12:16 ` Benjamin Tissoires [this message]
2019-10-11 2:08 ` Candle Sun
2019-10-10 3:05 ` Candle Sun
2019-10-10 7:42 ` Nicolas Saenz Julienne
2019-10-10 12:24 ` Benjamin Tissoires
2019-10-11 2:38 ` Candle Sun
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