netdev - RE: A Regression between v4.2-rc2 and v4.2-rc3

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Date:	Wed, 22 Jul 2015 06:58:10 +0000
From:	Duan Andy <fugang.duan@...escale.com>
To:	Peter Chen <Peter.Chen@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>
Subject: RE: A Regression between v4.2-rc2 and v4.2-rc3

From: Peter Chen <peter.chen@...escale.com> Sent: Wednesday, July 22, 2015 1:45 PM
> To: netdev@...r.kernel.org
> Cc: Andrew Lunn; Duan Fugang-B38611; David S. Miller
> Subject: A Regression between v4.2-rc2 and v4.2-rc3
> 
> Hi List,
> 
> I run out a kernel oops [2] for nfsroot at several imx6 boards when
> rebase to v4.2-rc3, after revert below patch [1], it is ok.
> This patch is just adding runtime pm for ipg clock, I am wonder why it
> takes as a bug fix.
> 
> [1]
> commit 6c3e921b18edca290099adfddde8a50236bf2d80
> Author: Andrew Lunn <andrew@...n.ch>
> Date:   Mon Jul 6 20:34:55 2015 +0200
> 
>     net: fec: Ensure clocks are enabled while using mdio bus
> 
>     When a switch is attached to the mdio bus, the mdio bus can be used
>     while the interface is not open. If the IPG clock is not enabled,
> MDIO
>     reads/writes will simply time out.
> 
>     Add support for runtime PM to control this clock. Enable/disable this
>     clock using runtime PM, with open()/close() and mdio read()/write()
>     function triggering runtime PM operations. Since PM is optional, the
>     IPG clock is enabled at probe and is no longer modified by
>     fec_enet_clk_enable(), thus if PM is not enabled in the kernel, it is
>     guaranteed the clock is running when MDIO operations are performed.
> 
>     Signed-off-by: Andrew Lunn <andrew@...n.ch>
>     Acked-by: Fugang Duan <B38611@...escale.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 

The patch was reverted in last week.

Regards,
Andy
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