linux-kernel - Re: [PATCH] staging: rtl8192e: use explicitly signed char

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Date:   Tue, 25 Oct 2022 12:45:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH] staging: rtl8192e: use explicitly signed char

On Tue, Oct 25, 2022 at 09:19:58AM +0300, Dan Carpenter wrote:
> On Mon, Oct 24, 2022 at 06:30:05PM +0200, Jason A. Donenfeld wrote:
> > With char becoming unsigned by default, and with `char` alone being
> > ambiguous and based on architecture, signed chars need to be marked
> > explicitly as such. In this case, passing `char *extra` is part of the
> > iw API, and that extra is mostly intended to be somewhat opaque. So just
> > cast to `s8 *` for the sign test. This fixes warnings like:
> > 
> > drivers/staging/rtl8192e/rtllib_softmac_wx.c:459 rtllib_wx_set_essid() warn: impossible condition '(extra[i] < 0) => (0-255 < 0)'
> > 
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: linux-staging@...ts.linux.dev
> > Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> > ---
> >  drivers/staging/rtl8192e/rtllib_softmac_wx.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/rtl8192e/rtllib_softmac_wx.c b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> > index f9589c5b62ba..4563e3b5bd47 100644
> > --- a/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> > +++ b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> > @@ -456,7 +456,7 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
> >  	}
> >  
> >  	for (i = 0; i < len; i++) {
> > -		if (extra[i] < 0) {
> > +		if (((s8 *)extra)[i] < 0) {
> 
> I agree with Linus that this if statement is nonsense and should just be
> deleted.

Yeah, I agree as well, let's just delete this invalid check.  No other
wifi driver cares about ssid characters like this.

thanks,

greg k-h