[PATCH 5.8 087/148] igc: Fix PTP initialization

Greg Kroah-Hartman
2020-08-24T08:37:04Z

From: Vinicius Costa Gomes <vinicius.gomes@intel.com>

[ Upstream commit 3cda505a679ced78d69c889cfb418d1728bb2707 ]

Right now, igc_ptp_reset() is called from igc_reset(), which is called
from igc_probe() before igc_ptp_init() has a chance to run. It is
detected as an attempt to use an spinlock without registering its key
first. See log below.

To avoid this problem, simplify the initialization: igc_ptp_init() is
only called from igc_probe(), and igc_ptp_reset() is only called from
igc_reset().

[ 2.736332] INFO: trying to register non-static key.
[ 2.736902] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input10
[ 2.737513] the code is fine but needs lockdep annotation.
[ 2.737513] turning off the locking correctness validator.
[ 2.737515] CPU: 8 PID: 239 Comm: systemd-udevd Tainted: G E 5.8.0-rc7+ #13
[ 2.737515] Hardware name: Gigabyte Technology Co., Ltd. Z390 AORUS ULTRA/Z390 AORUS ULTRA-CF, BIOS F7 03/14/2019
[ 2.737516] Call Trace:
[ 2.737521] dump_stack+0x78/0xa0
[ 2.737524] register_lock_class+0x6b1/0x6f0
[ 2.737526] ? lockdep_hardirqs_on_prepare+0xca/0x160
[ 2.739177] ? _raw_spin_unlock_irq+0x24/0x50
[ 2.739179] ? trace_hardirqs_on+0x1c/0xf0
[ 2.740820] __lock_acquire+0x56/0x1ff0
[ 2.740823] ? __schedule+0x30c/0x970
[ 2.740825] lock_acquire+0x97/0x3e0
[ 2.740830] ? igc_ptp_reset+0x35/0xf0 [igc]
[ 2.740833] ? schedule_hrtimeout_range_clock+0xb7/0x120
[ 2.742507] _raw_spin_lock_irqsave+0x3a/0x50
[ 2.742512] ? igc_ptp_reset+0x35/0xf0 [igc]
[ 2.742515] igc_ptp_reset+0x35/0xf0 [igc]
[ 2.742519] igc_reset+0x96/0xd0 [igc]
[ 2.744148] igc_probe+0x68f/0x7d0 [igc]
[ 2.745796] local_pci_probe+0x3d/0x70
[ 2.745799] pci_device_probe+0xd1/0x190
[ 2.745802] really_probe+0x15a/0x3f0
[ 2.759936] driver_probe_device+0xe1/0x150
[ 2.759937] device_driver_attach+0xa8/0xb0
[ 2.761786] __driver_attach+0x89/0x150
[ 2.761786] ? device_driver_attach+0xb0/0xb0
[ 2.761787] ? device_driver_attach+0xb0/0xb0
[ 2.761788] bus_for_each_dev+0x66/0x90
[ 2.765012] bus_add_driver+0x12e/0x1f0
[ 2.765716] driver_register+0x8b/0xe0
[ 2.766418] ? 0xffffffffc0230000
[ 2.767119] do_one_initcall+0x5a/0x310
[ 2.767826] ? kmem_cache_alloc_trace+0xe9/0x200
[ 2.768528] do_init_module+0x5c/0x260
[ 2.769206] __do_sys_finit_module+0x93/0xe0
[ 2.770048] do_syscall_64+0x46/0xa0
[ 2.770716] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2.771396] RIP: 0033:0x7f83534589e0
[ 2.772073] Code: 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 2e 2e 2e 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 80 24 0d 00 f7 d8 64 89 01 48
[ 2.772074] RSP: 002b:00007ffd31d0ed18 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 2.774854] RAX: ffffffffffffffda RBX: 000055d52816aba0 RCX: 00007f83534589e0
[ 2.774855] RDX: 0000000000000000 RSI: 00007f83535b982f RDI: 0000000000000006
[ 2.774855] RBP: 00007ffd31d0ed60 R08: 0000000000000000 R09: 00007ffd31d0ed30
[ 2.774856] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
[ 2.774856] R13: 0000000000020000 R14: 00007f83535b982f R15: 000055d527f5e120

Fixes: 5f2958052c58 ("igc: Add basic skeleton for PTP")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reviewed-by: Andre Guedes <andre.guedes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/igc/igc_main.c | 5 ++---
drivers/net/ethernet/intel/igc/igc_ptp.c | 2 --
2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 6919c50e449a2..63259ecd41e5b 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5158,6 +5158,8 @@ static int igc_probe(struct pci_dev *pdev,
device_set_wakeup_enable(&adapter->pdev->dev,
adapter->flags & IGC_FLAG_WOL_SUPPORTED);

+ igc_ptp_init(adapter);
+
/* reset the hardware with the new settings */
igc_reset(adapter);

@@ -5174,9 +5176,6 @@ static int igc_probe(struct pci_dev *pdev,
/* carrier off reporting is important to ethtool even BEFORE open */
netif_carrier_off(netdev);

- /* do hw tstamp init after resetting */
- igc_ptp_init(adapter);
-
/* Check if Media Autosense is enabled */
adapter->ei = *ei;

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 0d746f8588c81..61e38853aa47d 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -608,8 +608,6 @@ void igc_ptp_init(struct igc_adapter *adapter)
adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;

- igc_ptp_reset(adapter);
-
adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
&adapter->pdev->dev);
if (IS_ERR(adapter->ptp_clock)) {
--
2.25.1