netdev - Re: [PATCH] net: smsc911x: Fix crash if loopback test fails

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Date:	Sun, 01 Nov 2015 12:05:53 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	p.fedin@...sung.com
Cc:	netdev@...r.kernel.org, steve.glendinning@...well.net
Subject: Re: [PATCH] net: smsc911x: Fix crash if loopback test fails

From: Pavel Fedin <p.fedin@...sung.com>
Date: Thu, 29 Oct 2015 09:45:22 +0300

> On certain hardware in certain situations loopback test fails and the
> driver gets removed. During mdiobus_unregister() instance of PHY driver
> gets disposed. But by this time it has already been started using
> phy_connect_direct().
> 
> PHY driver uses DELAYED_WORK in order to maintain its state. Attempting
> to dispose the driver without calling phy_disconnect() causes deallocation
> of DELAYED_WORK being active. This shortly causes a bad crash in timer
> code.
> 
> The problem can be discovered by enabling CONFIG_DEBUG_OBJECTS_TIMERS and
> CONFIG_DEBUG_OBJECTS_FREE
> 
> Signed-off-by: Pavel Fedin <p.fedin@...sung.com>

Applied, thanks.
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