Re: [PATCH ath-next v2 0/2] wifi: ath11k: fix SoC reboot on firmware crash on AHB

[Baochen Qiang <baochen.qiang@oss.qualcomm.com>]

On 7/27/2026 6:19 AM, Julius Bairaktaris wrote:
> On IPQ8074 every firmware assert takes the whole SoC down. The DP NAPI
> keeps polling while ath11k_core_reconfigure_on_crash() frees the data
> path underneath it, and dereferences a ring the teardown has already
> cleared.
> 
> The interrupts used to be disabled at the top of that function.
> commit d455e805de70 ("wifi: ath11k: rearrange IRQ enable/disable in reset path")
> moved the disable into ath11k_core_reset(), which AHB parts never reach
> on a real firmware crash: reset_work is queued only from mhi.c and from
> the debugfs hw-restart handler. Patch 2 puts the disable back on the
> crash path. Patch 1 is a prerequisite - the CE half of the quiesce is a
> no-op on AHB today because the bus never implemented the hif ops.
> 
> Reproduced and fixed on a Xiaomi AX3600 (IPQ8074 hw2.0), with no
> out-of-tree modules loaded, using the debugfs simulate_fw_crash
> 'assert' trigger:
> 
>   before: 2/2 asserts panic in ath11k_dp_rx_process_mon_status() and
>           reboot the SoC
>   after:  3/3 asserts recover, 5 firmware boots across a single 397 s
>           uptime, no panics, both radios stay up
> 
> Note the debugfs 'hw-restart' trigger does not reproduce this, since it
> goes through ath11k_core_reset() - the one path that still disables the
> interrupts. Only a real firmware assert does.
> 
> Patch 1 is by inspection: it makes ath11k_hif_ce_irq_disable() take
> effect on AHB, which also fixes the existing call in
> ath11k_core_reset(). I have not managed to trigger a CE-side crash on
> its own, so if you would rather see that split out or dropped, say so.
> 
> Changes in v2 (no functional change, review comments from Jeff on 2/2):
> - separate the ath-specific Tested-on tag from the upstream tags with a
>   blank line
> - use the standard kernel block comment style, with /* on its own line
> 
> v1: https://lore.kernel.org/ath11k/20260725141757.1316877-1-julius@bairaktaris.de/
> 
> Julius Bairaktaris (2):
>   wifi: ath11k: implement CE interrupt enable/disable for AHB
>   wifi: ath11k: disable interrupts during firmware crash recovery
> 
>  drivers/net/wireless/ath/ath11k/ahb.c  |  9 ++++++++-
>  drivers/net/wireless/ath/ath11k/core.c | 10 ++++++++++
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 

Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>