netdev - phy deadlock -stable backport request

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Message-ID: <b985983c-f649-a880-8d8f-734a64e1a673@axis.com>
Date:   Mon, 27 Feb 2017 14:56:31 +0100
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     netdev <netdev@...r.kernel.org>
Subject: phy deadlock -stable backport request

Hello

I would like to request that

commit eab127717a6af54401ba534790c793ec143cd1fc
Author: Florian Fainelli <f.fainelli@...il.com>
Date:   Fri Jan 20 15:31:52 2017 -0800

    net: phy: Avoid deadlock during phy_error()
   
    phy_error() is called in the PHY state machine workqueue context, and
    calls phy_trigger_machine() which does a cancel_delayed_work_sync() of
    the workqueue we execute from, causing a deadlock situation.
   
    Augment phy_trigger_machine() machine with a sync boolean indicating
    whether we should use cancel_*_sync() or just cancel_*_work().
   
    Fixes: 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")
    Reported-by: Russell King <rmk+kernel@...linux.org.uk>
    Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

 drivers/net/phy/phy.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)


would be backported to stable branch v4.9.

I've seen this deadlock happen on v4.9.x


Regards,
Niklas