idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()

In idpf_ptp_init(), read_dev_clk_lock is initialized after
ptp_schedule_worker() had already been called (and after
idpf_ptp_settime64() could reach the lock). The PTP aux worker
fires immediately upon scheduling and can call into
idpf_ptp_read_src_clk_reg_direct(), which takes
spin_lock(&ptp->read_dev_clk_lock) on an uninitialized lock, triggering
the lockdep "non-static key" warning:

[12973.796587] idpf 0000:83:00.0: Device HW Reset initiated
[12974.094507] INFO: trying to register non-static key.
...
[12974.097208] Call Trace:
[12974.097213]  <TASK>
[12974.097218]  dump_stack_lvl+0x93/0xe0
[12974.097234]  register_lock_class+0x4c4/0x4e0
[12974.097249]  ? __lock_acquire+0x427/0x2290
[12974.097259]  __lock_acquire+0x98/0x2290
[12974.097272]  lock_acquire+0xc6/0x310
[12974.097281]  ? idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf]
[12974.097311]  ? lockdep_hardirqs_on_prepare+0xde/0x190
[12974.097318]  ? finish_task_switch.isra.0+0xd2/0x350
[12974.097330]  ? __pfx_ptp_aux_kworker+0x10/0x10 [ptp]
[12974.097343]  _raw_spin_lock+0x30/0x40
[12974.097353]  ? idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf]
[12974.097373]  idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf]
[12974.097391]  ? kthread_worker_fn+0x88/0x3d0
[12974.097404]  ? kthread_worker_fn+0x4e/0x3d0
[12974.097411]  idpf_ptp_update_cached_phctime+0x26/0x120 [idpf]
[12974.097428]  ? _raw_spin_unlock_irq+0x28/0x50
[12974.097436]  idpf_ptp_do_aux_work+0x15/0x20 [idpf]
[12974.097454]  ptp_aux_kworker+0x20/0x40 [ptp]
[12974.097464]  kthread_worker_fn+0xd5/0x3d0
[12974.097474]  ? __pfx_kthread_worker_fn+0x10/0x10
[12974.097482]  kthread+0xf4/0x130
[12974.097489]  ? __pfx_kthread+0x10/0x10
[12974.097498]  ret_from_fork+0x32c/0x410
[12974.097512]  ? __pfx_kthread+0x10/0x10
[12974.097519]  ret_from_fork_asm+0x1a/0x30
[12974.097540]  </TASK>

Move the call to spin_lock_init() up a bit to make sure read_dev_clk_lock
is not touched before it's been initialized.

Fixes: 5cb8805d2366 ("idpf: negotiate PTP capabilities and get PTP clock")
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260506-jk-iwl-net-2026-05-04-v2-3-a5ea4dc837a9@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/intel/idpf/idpf_ptp.c b/drivers/net/ethernet/intel/idpf/idpf_ptp.c
index eec91c4f0a75a091b41aadf166545e1b6580698d..4a51d2727547d9599ad45fd70a66d8ade85cb046 100644 (file)
--- a/drivers/net/ethernet/intel/idpf/idpf_ptp.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_ptp.c
@@ -952,6 +952,8 @@ int idpf_ptp_init(struct idpf_adapter *adapter)
                goto free_ptp;
        }
 
+       spin_lock_init(&adapter->ptp->read_dev_clk_lock);
+
        err = idpf_ptp_create_clock(adapter);
        if (err)
                goto free_ptp;
@@ -977,8 +979,6 @@ int idpf_ptp_init(struct idpf_adapter *adapter)
                        goto remove_clock;
        }
 
-       spin_lock_init(&adapter->ptp->read_dev_clk_lock);
-
        pci_dbg(adapter->pdev, "PTP init successful\n");
 
        return 0;