netdev - Re: [PATCH net-next 07/15] net: dsa: mt7530: do not run mt7530_setup

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Date: Sun, 17 Dec 2023 15:22:27 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Vladimir Oltean <olteanv@...il.com>,
 Dan Carpenter <dan.carpenter@...aro.org>
Cc: Simon Horman <horms@...nel.org>, Daniel Golle <daniel@...rotopia.org>,
 Landen Chao <Landen.Chao@...iatek.com>, DENG Qingfang <dqfext@...il.com>,
 Sean Wang <sean.wang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Bartel Eerdekens <bartel.eerdekens@...stell8.be>, mithat.guner@...ont.com,
 erkin.bozoglu@...ont.com
Subject: Re: [PATCH net-next 07/15] net: dsa: mt7530: do not run
 mt7530_setup_port5() if port 5 is disabled

On 8.12.2023 21:46, Vladimir Oltean wrote:
> Hmm, maybe the problem, all along, was that we let the -ENODEV return
> code from of_get_phy_mode() pass through? "interface" will really be
> uninitialized in that case. It's not a false positive.
> 
> Instead of:
> 
> 	ret = of_get_phy_mode(mac_np, &interface);
> 	if (ret && ret != -ENODEV) {
> 		...
> 		return ret;
> 	}
> 
> it should have been like this, to not complain:
> 
> 	ret = of_get_phy_mode(mac_np, &interface);
> 	if (ret) {
> 		...
> 		return ret;
> 	}
> 

I just tried this, smatch still reports "interface" as uninitialised.

$ export ARCH=mips CROSS_COMPILE=mips-linux-gnu-
$ ../smatch/smatch_scripts/kchecker --spammy drivers/net/dsa/mt7530.c

   UPD     include/config/kernel.release
   UPD     include/generated/utsrelease.h
   CHECK   scripts/mod/empty.c
   CALL    scripts/checksyscalls.sh
   CC      drivers/net/dsa/mt7530.o
   CHECK   drivers/net/dsa/mt7530.c
drivers/net/dsa/mt7530.c:217 mt7530_mii_read() warn: call of 'warn_slowpath_fmt' with non-constant format argument
drivers/net/dsa/mt7530.c:454 mt7530_setup_port6() error: uninitialized symbol 'ncpo1'.
drivers/net/dsa/mt7530.c:868 mt7530_set_ageing_time() error: uninitialized symbol 'age_count'.
drivers/net/dsa/mt7530.c:868 mt7530_set_ageing_time() error: uninitialized symbol 'age_unit'.
drivers/net/dsa/mt7530.c:2324 mt7530_setup() error: uninitialized symbol 'interface'.

Arınç