[{"id":3673178,"web_url":"http://patchwork.ozlabs.org/comment/3673178/","msgid":"","list_archive_url":null,"date":"2026-04-03T15:36:49","subject":"Re: [Intel-wired-lan] [PATCH iwl-net] idpf: fix read_dev_clk_lock\n spinlock init in idpf_ptp_init()","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/people/75597/","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"content":"> -----Original Message-----\n> From: Tantilov, Emil S \n> Sent: Friday, April 3, 2026 5:36 PM\n> To: intel-wired-lan@lists.osuosl.org\n> Cc: netdev@vger.kernel.org; Nguyen, Anthony L\n> ; Loktionov, Aleksandr\n> ; Kitszel, Przemyslaw\n> ; andrew+netdev@lunn.ch;\n> davem@davemloft.net; edumazet@google.com; kuba@kernel.org;\n> pabeni@redhat.com; richardcochran@gmail.com; Olech, Milena\n> ; Keller, Jacob E ;\n> Ilichev, Konstantin \n> Subject: [PATCH iwl-net] idpf: fix read_dev_clk_lock spinlock init in\n> idpf_ptp_init()\n> \n> In idpf_ptp_init(), read_dev_clk_lock is initialized after\n> ptp_schedule_worker() had already been called (and after\n> idpf_ptp_settime64() could reach the lock). The PTP aux worker fires\n> immediately upon scheduling and can call into\n> idpf_ptp_read_src_clk_reg_direct(), which takes\n> spin_lock(&ptp->read_dev_clk_lock) on an uninitialized lock,\n> triggering the lockdep \"non-static key\" warning:\n> \n> [12973.796587] idpf 0000:83:00.0: Device HW Reset initiated\n> [12974.094507] INFO: trying to register non-static key.\n> ...\n> [12974.097208] Call Trace:\n> [12974.097213] \n> [12974.097218] dump_stack_lvl+0x93/0xe0 [12974.097234]\n> register_lock_class+0x4c4/0x4e0 [12974.097249] ?\n> __lock_acquire+0x427/0x2290 [12974.097259] __lock_acquire+0x98/0x2290\n> [12974.097272] lock_acquire+0xc6/0x310 [12974.097281] ?\n> idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf] [12974.097311] ?\n> lockdep_hardirqs_on_prepare+0xde/0x190\n> [12974.097318] ? finish_task_switch.isra.0+0xd2/0x350\n> [12974.097330] ? __pfx_ptp_aux_kworker+0x10/0x10 [ptp] [12974.097343]\n> _raw_spin_lock+0x30/0x40 [12974.097353] ?\n> idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf] [12974.097373]\n> idpf_ptp_read_src_clk_reg+0xb7/0x150 [idpf] [12974.097391] ?\n> kthread_worker_fn+0x88/0x3d0 [12974.097404] ?\n> kthread_worker_fn+0x4e/0x3d0 [12974.097411]\n> idpf_ptp_update_cached_phctime+0x26/0x120 [idpf] [12974.097428] ?\n> _raw_spin_unlock_irq+0x28/0x50 [12974.097436]\n> idpf_ptp_do_aux_work+0x15/0x20 [idpf] [12974.097454]\n> ptp_aux_kworker+0x20/0x40 [ptp] [12974.097464]\n> kthread_worker_fn+0xd5/0x3d0 [12974.097474] ?\n> __pfx_kthread_worker_fn+0x10/0x10 [12974.097482] kthread+0xf4/0x130\n> [12974.097489] ? __pfx_kthread+0x10/0x10 [12974.097498]\n> ret_from_fork+0x32c/0x410 [12974.097512] ? __pfx_kthread+0x10/0x10\n> [12974.097519] ret_from_fork_asm+0x1a/0x30 [12974.097540] \n> \n> Move the call to spin_lock_init() up a bit to make sure\n> read_dev_clk_lock is not touched before it's been initialized.\n> \n> Fixes: 5cb8805d2366 (\"idpf: negotiate PTP capabilities and get PTP\n> clock\")\n> Signed-off-by: Emil Tantilov \n> Reviewed-by: Madhu Chittim \n> ---\n> drivers/net/ethernet/intel/idpf/idpf_ptp.c | 4 ++--\n> 1 file changed, 2 insertions(+), 2 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/idpf/idpf_ptp.c\n> b/drivers/net/ethernet/intel/idpf/idpf_ptp.c\n> index eec91c4f0a75..4a51d2727547 100644\n> --- a/drivers/net/ethernet/intel/idpf/idpf_ptp.c\n> +++ b/drivers/net/ethernet/intel/idpf/idpf_ptp.c\n> @@ -952,6 +952,8 @@ int idpf_ptp_init(struct idpf_adapter *adapter)\n> \t\tgoto free_ptp;\n> \t}\n> \n> +\tspin_lock_init(&adapter->ptp->read_dev_clk_lock);\n> +\n> \terr = idpf_ptp_create_clock(adapter);\n> \tif (err)\n> \t\tgoto free_ptp;\n> @@ -977,8 +979,6 @@ int idpf_ptp_init(struct idpf_adapter *adapter)\n> \t\t\tgoto remove_clock;\n> \t}\n> \n> -\tspin_lock_init(&adapter->ptp->read_dev_clk_lock);\n> -\n> \tpci_dbg(adapter->pdev, \"PTP init successful\\n\");\n> \n> \treturn 0;\n> --\n> 2.37.3\n\nReviewed-by: Aleksandr Loktionov ","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=uycJkGg9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; 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