linux-kernel - re: net: dsa: sja1105: use detected device id instead of DT one on mismatch

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Message-ID: <60d2d8f9-1376-2047-b958-7bdbbde1538e@canonical.com>
Date:   Thu, 6 Aug 2020 17:27:11 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Vladimir Oltean <olteanv@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: re: net: dsa: sja1105: use detected device id instead of DT one on
 mismatch

Hi,

Static analysis with Coverity has detected a potential issue with the
following commit:

commit 0b0e299720bb99428892a23ecbd2b4b7f61ccf6d
Author: Vladimir Oltean <olteanv@...il.com>
Date:   Mon Aug 3 19:48:23 2020 +0300

    net: dsa: sja1105: use detected device id instead of DT one on mismatch

The analysis is as follows:

Array compared against 0 (NO_EFFECT)array_null: Comparing an array to
null is not useful: match->compatible, since the test will always
evaluate as true.

    Was match->compatible formerly declared as a pointer?

3418        for (match = sja1105_dt_ids; match->compatible; match++) {
3419                const struct sja1105_info *info = match->data;
3420

I'm not sure what the original intention was, so I was unable to fix
this hence I'm sending this report as I think it needs addressing.

Colin