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

[Jeff Johnson]

On 6/11/2026 8:23 PM, Yingying Tang wrote:
> This reverts commit 809055628bce824b7fe18331abb65e44d02b0ecf.
> 
> Call trace:
> rcu_note_context_switch+0x4c4/0x508 (P)
> __schedule+0xbc/0x1204
> schedule+0x34/0x110
> schedule_timeout+0x84/0x11c
> __mhi_device_get_sync+0x164/0x228 [mhi]
> mhi_device_get_sync+0x1c/0x3c [mhi]
> ath12k_wifi7_pci_bus_wake_up+0x20/0x2c [ath12k_wifi7]
> ath12k_pci_read32+0x58/0x350 [ath12k]
> ath12k_pci_clear_dbg_registers+0x28/0xb8 [ath12k]
> ath12k_pci_panic_handler+0x20/0x44 [ath12k] ath12k_core_panic_handler+0x28/0x3c [ath12k]
> notifier_call_chain+0x78/0x1c0
> atomic_notifier_call_chain+0x3c/0x5c
> 
> ath12k_core_panic_handler() is invoked via atomic_notifier_call_chain(),
> which runs inside an RCU read-side critical section. The current code calls
> ath12k_pci_sw_reset() synchronously from this context, which eventually
> reaches mhi_device_get_sync() and schedule_timeout(), triggering a voluntary
> context switch within RCU.
> 
> Revert change "wifi: ath12k: add panic handler" to avoid this issue.
> 
> Tested-on: WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
> 
> Signed-off-by: Yingying Tang <yingying.tang at oss.qualcomm.com>

I've posted a version to my pending branch that incorporates the tags, fixes
the Tested-on tag, and rearranges the commit text. I plan on promoting to
ath-current early Tuesday morning PDT followed immediately by a pull request
to wireless to hopefully get into v7.3-rc7.

I'll pick up any new tags, including Reviewed-by:, that I get between now and
then.

Please check:
https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git/commit/?h=pending&id=1606f6eeef30f540a6b6ba9ac47b86fa72198228