CVE-2026-64162

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

idpf: fix readdevclklock spinlock init in idpfptp_init()

In idpfptpinit(), readdevclk_lock is initialized after

ptpscheduleworker() had already been called (and after

idpfptpsettime64() could reach the lock). The PTP aux worker

fires immediately upon scheduling and can call into

idpfptpreadsrcclkregdirect(), which takes

spinlock(&ptp->readdevclklock) 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]  dumpstacklvl+0x93/0xe0

[12974.097234]  registerlockclass+0x4c4/0x4e0

[12974.097249]  ? _lockacquire+0x427/0x2290

[12974.097259]  _lockacquire+0x98/0x2290

[12974.097272]  lock_acquire+0xc6/0x310

[12974.097281]  ? idpfptpreadsrcclk_reg+0xb7/0x150 [idpf]

[12974.097311]  ? lockdephardirqson_prepare+0xde/0x190

[12974.097318]  ? finishtaskswitch.isra.0+0xd2/0x350

[12974.097330]  ? _pfxptpauxkworker+0x10/0x10 [ptp]

[12974.097343]  rawspin_lock+0x30/0x40

[12974.097353]  ? idpfptpreadsrcclk_reg+0xb7/0x150 [idpf]

[12974.097373]  idpfptpreadsrcclk_reg+0xb7/0x150 [idpf]

[12974.097391]  ? kthreadworkerfn+0x88/0x3d0

[12974.097404]  ? kthreadworkerfn+0x4e/0x3d0

[12974.097411]  idpfptpupdatecachedphctime+0x26/0x120 [idpf]

[12974.097428]  ? rawspinunlockirq+0x28/0x50

[12974.097436]  idpfptpdoauxwork+0x15/0x20 [idpf]

[12974.097454]  ptpauxkworker+0x20/0x40 [ptp]

[12974.097464]  kthreadworkerfn+0xd5/0x3d0

[12974.097474]  ? _pfxkthreadworkerfn+0x10/0x10

[12974.097482]  kthread+0xf4/0x130

[12974.097489]  ? _pfxkthread+0x10/0x10

[12974.097498]  retfromfork+0x32c/0x410

[12974.097512]  ? _pfxkthread+0x10/0x10

[12974.097519]  retfromfork_asm+0x1a/0x30

[12974.097540]  </TASK>

Move the call to spinlockinit() up a bit to make sure readdevclk_lock

is not touched before it's been initialized.