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Miller" , Sasha Levin , Greg Kroah-Hartman Date: Thu, 19 Apr 2018 19:11:07 +0300 In-Reply-To: References: <20180411183622.305902791@linuxfoundation.org> <20180411183630.390575424@linuxfoundation.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-Originating-IP: [95.76.156.53] X-ClientProxiedBy: AM6P193CA0016.EURP193.PROD.OUTLOOK.COM (2603:10a6:209:3e::29) To AM0PR04MB4290.eurprd04.prod.outlook.com (2603:10a6:208:67::17) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(2017052603328)(7153060)(7193020);SRVR:AM0PR04MB4290; X-Microsoft-Exchange-Diagnostics: 1;AM0PR04MB4290;3:2Rg+DYk4o+jRyRmOLTPS9q/hucnvJwTjReSdPwHUePCCCRYxQCdrbOmjnTHuCDD+cIxca3pCy+kM70pdj5sJ0ZodSSNOwLh4tRqhNlfNk/wIVZK5ePULOrU9dGYTtxMR3A4iUSza3dgPk3H01qCoXobjNyu7+JcBtXGN9SXPDETKvges8bE2dOPSc+SVVR8iXM/5LsJHitRnZ1i1fkjD9pc2ZONgTJWMHqbWIisYogsibUv7HFPk7CtL3rjzPG7T;25:JlYZbeumg7W4IESxxAZ8Y2PoZ4IGgiRHCNRCTCrusJ6w5RxVU+LOiRAJaJNKOGubKDKoLRAd8PspgmApH0G9S/6hp/Bbw+sWxA336cDIVk/6+IoHy6KpR14f2bAmG1PuohqfPcPgYUeAML7U6A2i160JI9qjeZzYN7Arg5/z3x8XhcKNkXX+Phd3zTGf9b7uStbSO9BRK3S+Wl1pKiWcLs+34cSq+R1HV3GU6OV3/iHK9pW0o5w0MFv5KcU5MvZkhP0NQcOsMC/MZ6AN8RW7UAJzIbxH+KWjOvgvyXl8dbf6iIZw0WH3BqMrDfS68sr0q39ivxezNdHBLBLePfgtCw==;31:bHfYT/VdTqQcS0zXYWyowyiXIpHwbfe45YXjOrZGfMxKK52egBjCQCu4qOdKw0EGXuoZf/5k6zgPmXxN15D4iq1hMnFy1NhMfLX9SE+RS72UFcWiswMkhmoiieu+V1xvoDPwowBp0msDKkdthnNYK8JtEd19Ze8eJdl/t3QzU70pIk6q0JKoQsqAMIHA9wfKrJUN4mCMjDPGYqr9RH4C0kYGpQ049AmQ9FVgrULpNR4= X-MS-TrafficTypeDiagnostic: AM0PR04MB4290: X-Microsoft-Exchange-Diagnostics: 1;AM0PR04MB4290;20: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;4:xgXoDTClEDPrgTC/+nVlUJrX8Tb1FjX/TUF0lXNfTH+ikRuk83jcIMZUEzDE/aS3mlRBVcXsBISMZ5GJSaaEfQPY9lA9EJ8Uup/wIKfmhgLe/dhryBD6E/kdCNy3cK81e5TqQaCabhUGugibAZc32yOJXzwOoAHoqeTSNSBnWjkQuUJjigf5t5LUkzoMFbgKh5HVFUqEPInlVxlI+eslLKFWRNFwhOSUCEw6ULp2lureKfcivG2VrovZUMdt5Ti+UBUM1S31LwuykUVu1Ly7nxEFU7MR50nSpdytSTLSISQIM084CasMeArJ9AkLCW6/pk3oW3OnSDzk9YHSfPd89T0cEBFdSSp254nN+Lham/8d2Vvpp0FxKJ8fPzZZ37JRPpVhuRbmtwYdzjp9xJBEOJko/i/WZDZJUyze+w3ItI0= X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:(28532068793085)(89211679590171)(185117386973197)(85827821059158); 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Do this by splitting the handling of these bits into a function > > that is also called on resume. > > > > This patch fixes ethernet suspend/resume on imx6ul-14x14-evk boards. > > > > Signed-off-by: Leonard Crestez > > Reviewed-by: Florian Fainelli > > Signed-off-by: David S. Miller > > Signed-off-by: Sasha Levin > > Signed-off-by: Greg Kroah-Hartman > > --- > >  drivers/net/phy/micrel.c |   42 ++++++++++++++++++++++++++++-------------- > >  1 file changed, 28 insertions(+), 14 deletions(-) > arm32 x15 device booting 4.9 kernel shows kernel warning and > the network is not working on the device. > > Linux version 4.9.95-rc1 (buildslave@lkft-01) (gcc version 6.2.1 20161016 >  (Linaro GCC 6.2-2016.11) ) #1 SMP Tue Apr 17 19:12:22 UTC 2018 > > Boot log kernel crash log: > -------------------------- > [   13.766589] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready > [   13.805441] net eth0: initializing cpsw version 1.15 (0) > [   13.930334] Unable to handle kernel NULL pointer dereference at > virtual address 00000008 > [   13.982009] PC is at kszphy_config_reset+0x1c/0x150 > [   13.986909] LR is at kszphy_resume+0x24/0x64 > LAVA job id: https://lkft.validation.linaro.org/scheduler/job/187429#L3341 Looking at this dump I'm guessing that phydev->priv is NULL at the start of kszphy_config_reset and this really shouldn't be happening. The phydev->priv field is initialized by kszphy_probe but your particular phy (KSZ9031) in linux-4.9.y does not seem to have .probe = kszphy_probe assigned in the struct phy_driver ksphy_driver array. In upstream this was added by commit bfe72442578b ("net: phy: micrel: fix crash when statistic requested for KSZ9031 phy"). The message for that patch claims to fix a kernel crash on this command:     ethtool --phy-statistics eth0 Looking at the code this issue should affect linux-4.9.y on your board. Naresh: can you please check? Commit bfe72442578b was not tagged or selected for stable but it seems to be a more serious issue. BTW, the original patch was 2nd of a series, actually making imx6ul- 4x14-evk correctly suspend/resume ethernet in linux-4.9.y also requires 1st commit e6f4292ae0a1 ("ARM: dts: imx6ul-14x14-evk: Add ksz8081 phy properties"). But this is not a terribly important fix. -- Regards, Leonard