netdev - Re: [PATCH v2 09/14] ravb: fix invalid context bug while changing link options by ethtool

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Message-ID: <e24a092c-9a7a-f246-f243-74835eb6b15b@mentor.com>
Date:   Thu, 5 Jul 2018 09:09:27 +0300
From:   Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     Andrew Lunn <andrew@...n.ch>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v2 09/14] ravb: fix invalid context bug while changing
 link options by ethtool

On 07/04/2018 11:14 AM, Vladimir Zapolskiy wrote:
> The change fixes sleep in atomic context bug, which is encountered
> every time when link settings are changed by ethtool.
> 
> Since commit 35b5f6b1a82b ("PHYLIB: Locking fixes for PHY I/O
> potentially sleeping") phy_start_aneg() function utilizes a mutex
> to serialize changes to phy state, however that helper function is
> called in atomic context under a grabbed spinlock, because
> phy_start_aneg() is called by phy_ethtool_ksettings_set() and by
> replaced phy_ethtool_sset() helpers from phylib.
> 
> Now duplex mode setting is enforced in ravb_adjust_link() only, also
> now RX/TX is disabled when link is put down or modifications to E-MAC
> registers ECMR and GECMR are expected for both cases of checked and
> ignored link status pin state from E-MAC interrupt handler.
> 
> Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver")

Here is an invalid commit specified, the proper tag is

Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")

--
Best wishes,
Vladimir