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Subject[PATCH 4.14 084/115] net: hns: Fix WARNING when hns modules installed
Date
[ Upstream commit c77804be53369dd4c15bfc376cf9b45948194cab ]

Commit 308c6cafde01 ("net: hns: All ports can not work when insmod hns ko
after rmmod.") add phy_stop in hns_nic_init_phy(), In the branch of "net",
this method is effective, but in the branch of "net-next", it will cause
a WARNING when hns modules loaded, reference to commit 2b3e88ea6528 ("net:
phy: improve phy state checking"):

[10.092168] ------------[ cut here ]------------
[10.092171] called from state READY
[10.092189] WARNING: CPU: 4 PID: 1 at ../drivers/net/phy/phy.c:854
phy_stop+0x90/0xb0
[10.092192] Modules linked in:
[10.092197] CPU: 4 PID:1 Comm:swapper/0 Not tainted 4.20.0-rc7-next-20181220 #1
[10.092200] Hardware name: Huawei TaiShan 2280 /D05, BIOS Hisilicon D05 UEFI
16.12 Release 05/15/2017
[10.092202] pstate: 60000005 (nZCv daif -PAN -UAO)
[10.092205] pc : phy_stop+0x90/0xb0
[10.092208] lr : phy_stop+0x90/0xb0
[10.092209] sp : ffff00001159ba90
[10.092212] x29: ffff00001159ba90 x28: 0000000000000007
[10.092215] x27: ffff000011180068 x26: ffff0000110a5620
[10.092218] x25: ffff0000113b6000 x24: ffff842f96dac000
[10.092221] x23: 0000000000000000 x22: 0000000000000000
[10.092223] x21: ffff841fb8425e18 x20: ffff801fb3a56438
[10.092226] x19: ffff801fb3a56000 x18: ffffffffffffffff
[10.092228] x17: 0000000000000000 x16: 0000000000000000
[10.092231] x15: ffff00001122d6c8 x14: ffff00009159b7b7
[10.092234] x13: ffff00001159b7c5 x12: ffff000011245000
[10.092236] x11: 0000000005f5e0ff x10: ffff00001159b750
[10.092239] x9 : 00000000ffffffd0 x8 : 0000000000000465
[10.092242] x7 : ffff0000112457f8 x6 : ffff0000113bd7ce
[10.092245] x5 : 0000000000000000 x4 : 0000000000000000
[10.092247] x3 : 00000000ffffffff x2 : ffff000011245828
[10.092250] x1 : 4b5860bd05871300 x0 : 0000000000000000
[10.092253] Call trace:
[10.092255] phy_stop+0x90/0xb0
[10.092260] hns_nic_init_phy+0xf8/0x110
[10.092262] hns_nic_try_get_ae+0x4c/0x3b0
[10.092264] hns_nic_dev_probe+0x1fc/0x480
[10.092268] platform_drv_probe+0x50/0xa0
[10.092271] really_probe+0x1f4/0x298
[10.092273] driver_probe_device+0x58/0x108
[10.092275] __driver_attach+0xdc/0xe0
[10.092278] bus_for_each_dev+0x74/0xc8
[10.092280] driver_attach+0x20/0x28
[10.092283] bus_add_driver+0x1b8/0x228
[10.092285] driver_register+0x60/0x110
[10.092288] __platform_driver_register+0x40/0x48
[10.092292] hns_nic_dev_driver_init+0x18/0x20
[10.092296] do_one_initcall+0x5c/0x180
[10.092299] kernel_init_freeable+0x198/0x240
[10.092303] kernel_init+0x10/0x108
[10.092306] ret_from_fork+0x10/0x18
[10.092308] ---[ end trace 1396dd0278e397eb ]---

This WARNING occurred because of calling phy_stop before phy_start.

The root cause of the problem in commit '308c6cafde01' is:

Reference to hns_nic_init_phy, the flag phydev->supported is changed after
phy_connect_direct. The flag phydev->supported is 0x6ff when hns modules is
loaded, so will not change Fiber Port power(Reference to marvell.c), which
is power on at default.
Then the flag phydev->supported is changed to 0x6f, so Fiber Port power is
off when removing hns modules.
When hns modules installed again, the flag phydev->supported is default
value 0x6ff, so will not change Fiber Port power(now is off), causing mac
link not up problem.

So the solution is change phy flags before phy_connect_direct.

Fixes: 308c6cafde01 ("net: hns: All ports can not work when insmod hns ko after rmmod.")
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/net/ethernet/hisilicon/hns/hns_enet.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 8fd0408178048..b681c07b33fb6 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -1267,6 +1267,12 @@ int hns_nic_init_phy(struct net_device *ndev, struct hnae_handle *h)
if (!h->phy_dev)
return 0;

+ phy_dev->supported &= h->if_support;
+ phy_dev->advertising = phy_dev->supported;
+
+ if (h->phy_if == PHY_INTERFACE_MODE_XGMII)
+ phy_dev->autoneg = false;
+
if (h->phy_if != PHY_INTERFACE_MODE_XGMII) {
phy_dev->dev_flags = 0;

@@ -1278,15 +1284,6 @@ int hns_nic_init_phy(struct net_device *ndev, struct hnae_handle *h)
if (unlikely(ret))
return -ENODEV;

- phy_dev->supported &= h->if_support;
- phy_dev->advertising = phy_dev->supported;
-
- if (h->phy_if == PHY_INTERFACE_MODE_XGMII)
- phy_dev->autoneg = false;
-
- if (h->phy_if == PHY_INTERFACE_MODE_SGMII)
- phy_stop(phy_dev);
-
return 0;
}

--
2.20.1


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