linux-kernel - Re: [PATCH] net: dsa: sja1105: Do not use address of compatible member in sja1105_check_device

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Message-ID: <8de404f5-2d09-dfc5-6477-76d705051bb0@gmail.com>
Date:   Fri, 21 Aug 2020 15:33:59 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] net: dsa: sja1105: Do not use address of compatible
 member in sja1105_check_device_id

On 8/21/20 3:25 PM, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/net/dsa/sja1105/sja1105_main.c:3418:38: warning: address of
> array 'match->compatible' will always evaluate to 'true'
> [-Wpointer-bool-conversion]
>         for (match = sja1105_dt_ids; match->compatible; match++) {
>         ~~~                          ~~~~~~~^~~~~~~~~~
> 1 warning generated.
> 
> We should check the value of the first character in compatible to see if
> it is empty or not. This matches how the rest of the tree iterates over
> IDs.
> 
> Fixes: 0b0e299720bb ("net: dsa: sja1105: use detected device id instead of DT one on mismatch")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1139
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian