linux-kernel - Re: [PATCH 4.19 01/80] net: dsa: Do not make user port errors fatal

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Date:   Tue, 19 May 2020 10:31:04 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 4.19 01/80] net: dsa: Do not make user port errors fatal



On 5/19/2020 12:17 AM, Pavel Machek wrote:
> Hi!
> 
>> From: Florian Fainelli <f.fainelli@...il.com>
>>
>> commit 86f8b1c01a0a537a73d2996615133be63cdf75db upstream.
>>
>> Prior to 1d27732f411d ("net: dsa: setup and teardown ports"), we would
>> not treat failures to set-up an user port as fatal, but after this
>> commit we would, which is a regression for some systems where interfaces
>> may be declared in the Device Tree, but the underlying hardware may not
>> be present (pluggable daughter cards for instance).
>>
> 
>> +++ b/net/dsa/dsa2.c
>> @@ -412,7 +412,7 @@ static int dsa_tree_setup_switches(struc
>>  
>>  		err = dsa_switch_setup(ds);
>>  		if (err)
>> -			return err;
>> +			continue;
> 
> The error code is discarded here, so user can now wonder "why does not
> my port work" with no indications in the logs... Should we do
> dev_info() here?

There are informational messages provided at various points where a
failure can happen and especially in the net/dsa/slave.c file where most
of the errors are. I do not think an additional is needed at all.
-- 
Florian