linux-kernel - Re: [PATCH v7] staging: vt6656: add error code handling to unused variable

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Date:   Mon, 30 Mar 2020 16:32:21 -0700
From:   "John B. Wyatt IV" <jbwyatt4@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     outreachy-kernel@...glegroups.com,
        Julia Lawall <julia.lawall@...ia.fr>,
        Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Quentin Deslandes <quentin.deslandes@...ev.co.uk>,
        Colin Ian King <colin.king@...onical.com>,
        Malcolm Priestley <tvboxspy@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] staging: vt6656: add error code handling to unused
 variable

On Tue, 2020-03-31 at 00:42 +0200, Stefano Brivio wrote:
> On Mon, 30 Mar 2020 15:37:18 -0700
> "John B. Wyatt IV" <jbwyatt4@...il.com> wrote:
> 
> > Add error code handling to unused 'ret' variable that was never
> > used.
> > Return an error code from functions called within
> > vnt_radio_power_on.
> > 
> > Issue reported by coccinelle (coccicheck).
> > 
> > Suggested-by: Quentin Deslandes <quentin.deslandes@...ev.co.uk>
> > Suggested-by: Stefano Brivio <sbrivio@...hat.com>
> > Reviewed-by: Quentin Deslandes <quentin.deslandes@...ev.co.uk>
> > Signed-off-by: John B. Wyatt IV <jbwyatt4@...il.com>
> > ---
> > v7: Move an if check.
> >     Suggested by Stefano Brivio <sbrivio@...hat.com>
> > 
> > v6: Forgot to add all the v5 code to commit.
> > 
> > v5: Remove Suggested-by: Julia Lawall above seperator line.
> >     Remove break; statement in switch block.
> >     break; removal checked by both gcc compile and checkpatch.
> >     Suggested by Stefano Brivio <sbrivio@...hat.com>
> > 
> > v4: Move Suggested-by: Julia Lawall above seperator line.
> >     Add Reviewed-by tag as requested by Quentin Deslandes.
> > 
> > v3: Forgot to add v2 code changes to commit.
> > 
> > v2: Replace goto statements with return.
> >     Remove last if check because it was unneeded.
> >     Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
> > 
> >  drivers/staging/vt6656/card.c | 20 ++++++++++++--------
> >  1 file changed, 12 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/staging/vt6656/card.c
> > b/drivers/staging/vt6656/card.c
> > index dc3ab10eb630..df12c73097e0 100644
> > --- a/drivers/staging/vt6656/card.c
> > +++ b/drivers/staging/vt6656/card.c
> > @@ -723,9 +723,13 @@ int vnt_radio_power_on(struct vnt_private
> > *priv)
> >  {
> >  	int ret = 0;
> >  
> > -	vnt_exit_deep_sleep(priv);
> > +	ret = vnt_exit_deep_sleep(priv);
> > +	if (ret)
> > +		return ret;
> >  
> > -	vnt_mac_reg_bits_on(priv, MAC_REG_HOSTCR, HOSTCR_RXON);
> > +	ret = vnt_mac_reg_bits_on(priv, MAC_REG_HOSTCR, HOSTCR_RXON);
> > +	if (ret)
> > +		return ret;
> >  
> >  	switch (priv->rf_type) {
> >  	case RF_AL2230:
> > @@ -734,14 +738,14 @@ int vnt_radio_power_on(struct vnt_private
> > *priv)
> >  	case RF_VT3226:
> >  	case RF_VT3226D0:
> >  	case RF_VT3342A0:
> > -		vnt_mac_reg_bits_on(priv, MAC_REG_SOFTPWRCTL,
> > -				    (SOFTPWRCTL_SWPE2 |
> > SOFTPWRCTL_SWPE3));
> > -		break;
> > +		ret = vnt_mac_reg_bits_on(priv, MAC_REG_SOFTPWRCTL,
> > +					  (SOFTPWRCTL_SWPE2 | 
> > +					  SOFTPWRCTL_SWPE3));
> 
> Grrr, sorry, almost there, I didn't notice this: SOFTPWRCTL_SWPE3
> needs
> to be aligned *after* the open (useless) parenthesis:
> 
> 					  (SOFTPWRCTL_SWPE2 | 
> 					   SOFTPWRCTL_SWPE3));
> 
> because it's another operand of the | operation surrounded by ().
> Doesn't checkpatch warn?
> 
> The rest looks good to me.
> 

I had to switch from a VM to native and forget to put the git hook in
this repo clone.

Still, after I did, checkpatch complained about trailing white space
after SOFTPWRCTL_SWPE2 |, but not the alignment issue. Fixing the
alignment issue produced no warnings either. :(