[PATCH ath-next] Revert "wifi: ath12k: add panic handler"

[Jeff Johnson]

On 10/4/2026 2:34 AM, Joonhoe Kim wrote:
> On Thu, Jun 11, 2026 at 08:23:32PM -0700, Yingying Tang wrote:
>> ath12k_core_panic_handler() is invoked via atomic_notifier_call_chain(),
>> which runs inside an RCU read-side critical section.
> 
> I hit this on a WCN7860 (hw2.0, PCI) in a Lenovo Legion Tab Y700 Gen 5
> (Kaanapali), v7.3-rc4 plus board patches. Here the panic never got past
> the notifier:
> 
>   SMP: stopping secondary CPUs
>   Voluntary context switch within RCU read-side critical section!
>    schedule_timeout
>    __mhi_device_get_sync
>    ath12k_wifi7_pci_bus_wake_up
>    ath12k_pci_read32
>    ath12k_pci_sw_reset
>    ath12k_pci_panic_handler
>    atomic_notifier_call_chain
>    vpanic
> 
> A hung_task panic stayed hung until a forced restart, and a sysrq crash
> only ended in a reset after about 50 s.
> 
> With the handler removed, a sysrq crash reboots normally, and after the
> reboot WCN7860 is enumerated again (PCIe Gen3 x2 link up) and Wi-Fi
> works.
> 
> Tested-by: Joonhoe Kim <26rote at gmail.com>
> 
> On Baochen's question, the handler came in with 809055628bce, so:
> Fixes: 809055628bce ("wifi: ath12k: add panic handler")

I'll pick this up and make the applicable cleanups.

/jeff