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

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Message-ID: <20200519071707.GA2609@amd>
Date:   Tue, 19 May 2020 09:17:07 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        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

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?

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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