linux-kernel - Re: [PATCH] net: ethernet: sun: remove redundant variables adv and lpa

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Message-ID: <20180705100125.blngjkgmzt334fza@mwanda>
Date:   Thu, 5 Jul 2018 13:01:25 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: sun: remove redundant variables adv and
 lpa

On Thu, Jul 05, 2018 at 10:54:51AM +0100, Colin Ian King wrote:
> On 05/07/18 10:52, Dan Carpenter wrote:
> > On Thu, Jul 05, 2018 at 10:37:32AM +0100, Colin King wrote:
> >> diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
> >> index 88c12474a0c3..2d6b62c6d9ab 100644
> >> --- a/drivers/net/ethernet/sun/niu.c
> >> +++ b/drivers/net/ethernet/sun/niu.c
> >> @@ -1225,17 +1225,13 @@ static int link_status_1g_rgmii(struct niu *np, int *link_up_p)
> >>  
> >>  	bmsr = err;
> >>  	if (bmsr & BMSR_LSTATUS) {
> >> -		u16 adv, lpa;
> >> -
> >>  		err = mii_read(np, np->phy_addr, MII_ADVERTISE);
> >>  		if (err < 0)
> >>  			goto out;
> >> -		adv = err;
> >>  
> >>  		err = mii_read(np, np->phy_addr, MII_LPA);
> >>  		if (err < 0)
> >>  			goto out;
> >> -		lpa = err;
> > 
> > I'm fairly sure we could get rid of the mii_read() calls as well.
> 
> I'm always concerned that removing the reads of H/W registers can affect
> the behavior, so I left those in.

Yeah...  That's true sometimes.  Hence my "fairly sure" equivocation.  I
looked to see if any of the original devs are around and it's been a
while since anyone worked on this driver.

When we remove these warnings it means that there is no chance that
someone will look at the code again and remove the unneeded mii_read()
calls.  I'm 90% sure the reads are unnecessary.

regards,
dan carpenter