netdev - Re: [PATCH v2] gianfar: correct the bad expression while writing bit-pattern

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Message-ID: <1421129715.4099.18.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 12 Jan 2015 22:15:15 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sanjeev Sharma <sanjeev_sharma@...tor.com>
Cc:	davem@...emloft.net, claudiu.manoil@...escale.com,
	peter.senna@...il.com, shemminger@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gianfar: correct the bad expression while writing
 bit-pattern

On Mon, 2015-01-12 at 22:01 -0800, Eric Dumazet wrote:
> On Tue, 2015-01-13 at 10:58 +0530, Sanjeev Sharma wrote:
> > This patch correct the bad expression while writing the
> > bit-pattern from software's buffer to hardware registers.
> > 
> > Signed-off-by: Sanjeev Sharma <Sanjeev_Sharma@...tor.com>
> > ---
> > Changes in v2:
> >   - incorporated review comment as per Sergei. 
> > 
> >  drivers/net/ethernet/freescale/gianfar_ethtool.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > index 3e1a9c1..347d5ee 100644
> > --- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > +++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > @@ -1586,7 +1586,7 @@ static int gfar_write_filer_table(struct gfar_private *priv,
> >  		return -EBUSY;
> >  
> >  	/* Fill regular entries */
> > -	for (; i < MAX_FILER_IDX - 1 && (tab->fe[i].ctrl | tab->fe[i].ctrl);
> > +	for (; i < MAX_FILER_IDX - 1 && i < tab->fe[i].ctrl);
> >  	     i++)
> >  		gfar_write_filer(priv, i, tab->fe[i].ctrl, tab->fe[i].prop);
> >  	/* Fill the rest with fall-troughs */
> 
> This makes no sense. Have you tried to compile this ?

I have no idea of what this code is trying to do, but most likely
author intent was to break loop when both ctrl and prop are 0 :

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index 3e1a9c1a67a9..fda12fb32ec7 100644
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -1586,7 +1586,7 @@ static int gfar_write_filer_table(struct gfar_private *priv,
 		return -EBUSY;
 
 	/* Fill regular entries */
-	for (; i < MAX_FILER_IDX - 1 && (tab->fe[i].ctrl | tab->fe[i].ctrl);
+	for (; i < MAX_FILER_IDX - 1 && (tab->fe[i].ctrl | tab->fe[i].prop);
 	     i++)
 		gfar_write_filer(priv, i, tab->fe[i].ctrl, tab->fe[i].prop);
 	/* Fill the rest with fall-troughs */


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