linux-kernel - Re: [PATCH] bnx2x: fix assignment of signed expression to unsigned variable

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Message-ID: <20130323204511.GA18813@gmail.com>
Date:	Sat, 23 Mar 2013 13:45:11 -0700
From:	Kumar amit mehta <gmate.amit@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	eilong@...adcom.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] bnx2x: fix assignment of signed expression to unsigned
 variable

On Sat, Mar 23, 2013 at 10:56:47PM +0300, Dan Carpenter wrote:
> On Sat, Mar 23, 2013 at 11:52:55AM -0700, Kumar Amit Mehta wrote:
> > fix for incorrect assignment of signed expression to unsigned variable.
> > 
> 
> This fix isn't right.
> 
> > Signed-off-by: Kumar Amit Mehta <gmate.amit@...il.com>
> > ---
> >  drivers/net/ethernet/broadcom/bnx2x/bnx2x_dcb.c |   20 ++++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_dcb.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_dcb.c
> > index 5682054..b90533a 100644
> > --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_dcb.c
> > +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_dcb.c
> > @@ -2139,12 +2139,12 @@ static u8 bnx2x_dcbnl_get_cap(struct net_device *netdev, int capid, u8 *cap)
> >  			break;
> >  		default:
> >  			BNX2X_ERR("Non valid capability ID\n");
> > -			rval = -EINVAL;
> > +			rval = EINVAL;
> >  			break;
> >  		}
> >  	} else {
> >  		DP(BNX2X_MSG_DCB, "DCB disabled\n");
> > -		rval = -EINVAL;
> > +		rval = EINVAL;
> 
> This function is called from dcbnl_getcap().  It returns zero on
> success, but it's not clear what it should return on failure.  But
> certainly it's not a positive EINVAL.
> 
> >  	}
> >  
> >  	DP(BNX2X_MSG_DCB, "capid %d:%x\n", capid, *cap);
> > @@ -2154,7 +2154,7 @@ static u8 bnx2x_dcbnl_get_cap(struct net_device *netdev, int capid, u8 *cap)
> >  static int bnx2x_dcbnl_get_numtcs(struct net_device *netdev, int tcid, u8 *num)
> >  {
> >  	struct bnx2x *bp = netdev_priv(netdev);
> > -	u8 rval = 0;
> > +	s8 rval = 0;
> 
> Just use "int" here.
> 
> >  
> >  	DP(BNX2X_MSG_DCB, "tcid %d\n", tcid);
> >  
> > @@ -2188,7 +2188,7 @@ static int bnx2x_dcbnl_set_numtcs(struct net_device *netdev, int tcid, u8 num)
> >  	return -EINVAL;
> >  }
> >  
> > -static u8  bnx2x_dcbnl_get_pfc_state(struct net_device *netdev)
> > +static u8 bnx2x_dcbnl_get_pfc_state(struct net_device *netdev)
> >  {
> >  	struct bnx2x *bp = netdev_priv(netdev);
> >  	DP(BNX2X_MSG_DCB, "state = %d\n", bp->dcbx_local_feat.pfc.enabled);
> > @@ -2282,7 +2282,7 @@ static int bnx2x_set_admin_app_up(struct bnx2x *bp, u8 idtype, u16 idval, u8 up)
> >  	else {
> >  		/* app table is full */
> >  		BNX2X_ERR("Application table is too large\n");
> > -		return -EBUSY;
> > +		return EBUSY;
> >  	}
> 
> The fix for this is more involved.  The function prototype should
> be changed to return an int.  The caller should be updated to check
> for errors.
>
I wonder, why these callbacks are restricting the lower layers to return
only unsigned values, However Updating the prototype doesn't seem a good idea as
then it would require changes in various existing drivers.
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