linux-kernel - Re: [PATCH] USB: serial: iuu_phoenix: remove redundant assignment of DIV to itself

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Message-ID: <20171127130610.GE9862@localhost>
Date:   Mon, 27 Nov 2017 14:06:10 +0100
From:   Johan Hovold <johan@...nel.org>
To:     walter harms <wharms@....de>
Cc:     Colin King <colin.king@...onical.com>,
        Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: iuu_phoenix: remove redundant assignment of
 DIV to itself

On Mon, Nov 20, 2017 at 09:15:27PM +0100, walter harms wrote:
> Am 20.11.2017 18:40, schrieb Colin King:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > The assignment of DIV to itself is redundant and can be removed.
> > 
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/usb/serial/iuu_phoenix.c | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c
> > index 397a8012ffa3..62c91e360baf 100644
> > --- a/drivers/usb/serial/iuu_phoenix.c
> > +++ b/drivers/usb/serial/iuu_phoenix.c
> > @@ -472,7 +472,6 @@ static int iuu_clk(struct usb_serial_port *port, int dwFrq)
> >  				}
> >  	}
> >  	P2 = ((P - PO) / 2) - 4;
> > -	DIV = DIV;
> >  	PUMP = 0x04;
> >  	PBmsb = (P2 >> 8 & 0x03);
> >  	PBlsb = P2 & 0xFF;
> 
> These all all-upper-case stuff makes me a bit nervous. Normally this
> is reserved for #define ( I assume that the programmer refers to
> the original documentation) a point to change ?

Yeah, this isn't pretty and appears to have been copied directly from
the iuutool userspace tool (mentioned in the header).

> btw: i noticed  int frq = (int)dwFrq;
> since dwFrq is already an in, the cast is useless.

Indeed. Also present in original code.

This driver went in marked as "experimental", but the dependency on
CONFIG_EXPERIMENTAL was later dropped. These days something like this
would have need to be cleaned up (e.g. in staging) before getting
merged.

Johan