CVE-2026-64162

In the Linux kernel, the following vulnerability has been resolved:

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.