linux-kernel - Re: [PATCH 2/3] staging/rtl8192e: use s8 instead of char

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Message-ID: <wrfjlh0xvck3.fsf@redhat.com>
Date:	Tue, 19 Jul 2016 12:05:00 -0400
From:	Jes Sorensen <Jes.Sorensen@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-wireless@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	netdev@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mateusz Kulikowski <mateusz.kulikowski@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] staging/rtl8192e: use s8 instead of char

Arnd Bergmann <arnd@...db.de> writes:
> On Tuesday, July 19, 2016 11:46:04 AM CEST Jes Sorensen wrote:
>> > diff --git a/drivers/staging/rtl8192e/rtl819x_TSProc.c b/drivers/staging/rtl8192e/rtl819x_TSProc.c
>> > index 2c8a526773ed..e0a2fe5e6148 100644
>> > --- a/drivers/staging/rtl8192e/rtl819x_TSProc.c
>> > +++ b/drivers/staging/rtl8192e/rtl819x_TSProc.c
>> > @@ -323,7 +323,7 @@ bool GetTs(struct rtllib_device *ieee, struct ts_common_info **ppTS,
>> >       if (ieee->current_network.qos_data.supported == 0) {
>> >               UP = 0;
>> >       } else {
>> > -             if (!IsACValid(TID)) {
>> > +             if (!IsACValid((s8)TID)) {
>> >                       netdev_warn(ieee->dev, "%s(): TID(%d) is not valid\n",
>> >                                   __func__, TID);
>> >                       return false;
>> 
>> TID is a 4-bit field, it should never go negative. The cast to s8 seems
>> wrong to me, if anything it should be using u8. I do realize the macro
>> IsACValid checks against negative too, but that just looks silly to me.
>
> Ok, I'll remove the extra comparison then to avoid the warning:
>
> staging/rtl8192e/rtl819x_TSProc.c:326:14: error: comparison is always
> true due to limited range of data type [-Werror=type-limits]
>
> I guess it should be a separate patch. I had just stumbled over the
> same thing before resending the patch but decided not to change it
> to keep the patch simple.

I think that would be better, albeit not a big issue. I'd like to get
rid of all the drivers/staging/rtl* drivers eventually :)

Cheers,
Jes