netdev - [PATCH 1/2] Revert "igc: fix a log entry using uninitialized netdev"

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Date: Sat,  1 Jun 2024 08:06:00 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Corinna Vinschen <vinschen@...hat.com>,
	Hariprasad Kelam <hkelam@...vell.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	Naama Meir <naamax.meir@...ux.intel.com>,
	netdev@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 1/2] Revert "igc: fix a log entry using uninitialized netdev"

This reverts commit 86167183a17e03ec77198897975e9fdfbd53cb0b.

The commit in question moved call to igc_ptp_init() to happen after
igc_reset() which calls igc_ptp_reset() with the spinlock not yet
initialized so we get following splat:

 BUG: spinlock bad magic on CPU#4, udevd/249
  lock: 0xffff98f317e6d4b0, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
 CPU: 4 PID: 249 Comm: udevd Not tainted 6.10.0-rc1+ #1312
 Call Trace:
  <TASK>
  dump_stack_lvl+0x6c/0x90
  dump_stack+0x10/0x20
  spin_bug+0x8c/0xc0
  do_raw_spin_lock+0x6c/0xc0
  _raw_spin_lock_irqsave+0x30/0x40
  igc_ptp_clear_tx_tstamp+0x2e/0xc0 [igc]
  igc_ptp_set_timestamp_mode+0x191/0x280 [igc]
  igc_ptp_reset+0x33/0x230 [igc]
  igc_reset+0xba/0x100 [igc]
  igc_probe+0x7d1/0xa10 [igc]

It is likely that there are other things igc_ptp_init() does that are
required by igc_ptp_reset(), so for this reason revert the commit in
question.

Fixes: 86167183a17e ("igc: fix a log entry using uninitialized netdev")
Cc: Corinna Vinschen <vinschen@...hat.com>
Cc: Hariprasad Kelam <hkelam@...vell.com>
Cc: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc: Naama Meir <naamax.meir@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 12f004f46082..ace2fbfd87d6 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -7028,6 +7028,8 @@ 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);
+
 	igc_tsn_clear_schedule(adapter);
 
 	/* reset the hardware with the new settings */
@@ -7049,9 +7051,6 @@ static int igc_probe(struct pci_dev *pdev,
 	/* Check if Media Autosense is enabled */
 	adapter->ei = *ei;
 
-	/* do hw tstamp init after resetting */
-	igc_ptp_init(adapter);
-
 	/* print pcie link status and MAC address */
 	pcie_print_link_status(pdev);
 	netdev_info(netdev, "MAC: %pM\n", netdev->dev_addr);
-- 
2.43.0