linux-kernel - Re: [PATCH rtw-next v2 1/2] wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from

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Message-ID: <59764dcc-eb0a-41af-880f-e7b41c15ec0a@RTEXDAG02.realtek.com.tw>
Date: Tue, 10 Jun 2025 09:44:01 +0800
From: Ping-Ke Shih <pkshih@...ltek.com>
To: Fedor Pchelkin <pchelkin@...ras.ru>, Ping-Ke Shih <pkshih@...ltek.com>
CC: Fedor Pchelkin <pchelkin@...ras.ru>,
        Zong-Zhe Yang
	<kevin_yang@...ltek.com>,
        <linux-wireless@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lvc-project@...uxtesting.org>
Subject: Re: [PATCH rtw-next v2 1/2] wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from_acpi

Fedor Pchelkin <pchelkin@...ras.ru> wrote:

> The following assertion is triggered on the rtw89 driver startup. It
> looks meaningless to hold wiphy lock on the early init stage so drop the
> assertion.
> 
>  WARNING: CPU: 7 PID: 629 at drivers/net/wireless/realtek/rtw89/sar.c:502 rtw89_set_sar_from_acpi+0x365/0x4d0 [rtw89_core]
>  CPU: 7 UID: 0 PID: 629 Comm: (udev-worker) Not tainted 6.15.0+ #29 PREEMPT(lazy)
>  Hardware name: LENOVO 21D0/LNVNB161216, BIOS J6CN50WW 09/27/2024
>  RIP: 0010:rtw89_set_sar_from_acpi+0x365/0x4d0 [rtw89_core]
>  Call Trace:
>   <TASK>
>   rtw89_sar_init+0x68/0x2c0 [rtw89_core]
>   rtw89_core_init+0x188e/0x1e50 [rtw89_core]
>   rtw89_pci_probe+0x530/0xb50 [rtw89_pci]
>   local_pci_probe+0xd9/0x190
>   pci_call_probe+0x183/0x540
>   pci_device_probe+0x171/0x2c0
>   really_probe+0x1e1/0x890
>   __driver_probe_device+0x18c/0x390
>   driver_probe_device+0x4a/0x120
>   __driver_attach+0x1a0/0x530
>   bus_for_each_dev+0x10b/0x190
>   bus_add_driver+0x2eb/0x540
>   driver_register+0x1a3/0x3a0
>   do_one_initcall+0xd5/0x450
>   do_init_module+0x2cc/0x8f0
>   init_module_from_file+0xe1/0x150
>   idempotent_init_module+0x226/0x760
>   __x64_sys_finit_module+0xcd/0x150
>   do_syscall_64+0x94/0x380
>   entry_SYSCALL_64_after_hwframe+0x76/0x7e
> 
> Found by Linux Verification Center (linuxtesting.org).
> 
> Fixes: 88ca3107d2ce ("wifi: rtw89: sar: add skeleton for SAR configuration via ACPI")
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>

2 patch(es) applied to rtw-next branch of rtw.git, thanks.

6fe21445f7e8 wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from_acpi
dad7aafa5216 wifi: rtw89: sar: do not assert wiphy lock held until probing is done

---
https://github.com/pkshih/rtw.git