From: Peter Chen <[email protected]> Sent: Wednesday, July 22, 2015 1:45 PM > To: [email protected] > 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 <[email protected]> > 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 <[email protected]> > Acked-by: Fugang Duan <[email protected]> > Signed-off-by: David S. Miller <[email protected]> >
The patch was reverted in last week. Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
