linux-kernel - Re: [PATCH v2] staging: vt6656: Add formula to the vnt_rf

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Message-ID: <20200425140237.GB3213@ubuntu>
Date:   Sat, 25 Apr 2020 16:02:37 +0200
From:   Oscar Carter <oscar.carter@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Oscar Carter <oscar.carter@....com>,
        Forest Bond <forest@...ttletooquiet.net>,
        devel@...verdev.osuosl.org, Malcolm Priestley <tvboxspy@...il.com>,
        linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v2] staging: vt6656: Add formula to the vnt_rf_addpower
 function

On Sat, Apr 25, 2020 at 12:57:14PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 23, 2020 at 07:05:57PM +0200, Oscar Carter wrote:
> > Use a formula to calculate the return value of the vnt_rf_addpower
> > function instead of the "if" statement with literal values for every
> > case.
> >
> > Signed-off-by: Oscar Carter <oscar.carter@....com>
> > ---
> > Changelog v1 -> v2
> > - Change the type of "base" variable from s32 to int as Dan Carpenter
> >   suggested.
> > - Remove the "--" postoperator and replace with (base - 1) as Dan
> >   Carpenter suggested. Also, as this expression has a minus before the
> >   parenthesis, remove it an apply the minus operator changing the sign of
> >   "base" and literal "1".
> >
> >  drivers/staging/vt6656/rf.c | 20 +++-----------------
> >  1 file changed, 3 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/staging/vt6656/rf.c b/drivers/staging/vt6656/rf.c
> > index 06fa8867cfa3..612fd4a59f8a 100644
> > --- a/drivers/staging/vt6656/rf.c
> > +++ b/drivers/staging/vt6656/rf.c
> > @@ -538,28 +538,14 @@ int vnt_rf_write_embedded(struct vnt_private *priv, u32 data)
> >
> >  static u8 vnt_rf_addpower(struct vnt_private *priv)
> >  {
> > +	int base;
> >  	s32 rssi = -priv->current_rssi;
> >
> >  	if (!rssi)
> >  		return 7;
> >
> > -	if (priv->rf_type == RF_VT3226D0) {
> > -		if (rssi < -70)
> > -			return 9;
> > -		else if (rssi < -65)
> > -			return 7;
> > -		else if (rssi < -60)
> > -			return 5;
> > -	} else {
> > -		if (rssi < -80)
> > -			return 9;
> > -		else if (rssi < -75)
> > -			return 7;
> > -		else if (rssi < -70)
> > -			return 5;
> > -	}
> > -
> > -	return 0;
> > +	base = (priv->rf_type == RF_VT3226D0) ? -60 : -70;
> > +	return (rssi < base) ? ((rssi - base + 1) / -5) * 2 + 5 : 0;
>
> I _hate_ ? : functions, just spell this out please as a real if()
> statement.
>
Ok, I will do the modification and I will resend a new version patch.

> thanks,
>
> greg k-h

thanks,

oscar carter