linux-kernel - Re: [PATCHv3] wifi: ath11k: clear initialized flag for deinit-ed srng lists

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Message-ID: <73c6cd0a-9c15-421e-afa4-27fe173bb428@quicinc.com>
Date: Thu, 12 Jun 2025 18:49:03 +0800
From: Baochen Qiang <quic_bqiang@...cinc.com>
To: Sergey Senozhatsky <senozhatsky@...omium.org>,
        Jeff Johnson
	<jjohnson@...nel.org>
CC: <linux-wireless@...r.kernel.org>, <ath11k@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3] wifi: ath11k: clear initialized flag for deinit-ed srng
 lists



On 6/12/2025 4:45 PM, Sergey Senozhatsky wrote:
> In a number of cases we see kernel panics on resume due
> to ath11k kernel page fault, which happens under the
> following circumstances:
> 
> 1) First ath11k_hal_dump_srng_stats() call
> 
>  Last interrupt received for each group:
>  ath11k_pci 0000:01:00.0: group_id 0 22511ms before
>  ath11k_pci 0000:01:00.0: group_id 1 14440788ms before
>  [..]
>  ath11k_pci 0000:01:00.0: failed to receive control response completion, polling..
>  ath11k_pci 0000:01:00.0: Service connect timeout
>  ath11k_pci 0000:01:00.0: failed to connect to HTT: -110
>  ath11k_pci 0000:01:00.0: failed to start core: -110
>  ath11k_pci 0000:01:00.0: firmware crashed: MHI_CB_EE_RDDM
>  ath11k_pci 0000:01:00.0: already resetting count 2
>  ath11k_pci 0000:01:00.0: failed to wait wlan mode request (mode 4): -110
>  ath11k_pci 0000:01:00.0: qmi failed to send wlan mode off: -110
>  ath11k_pci 0000:01:00.0: failed to reconfigure driver on crash recovery
>  [..]
> 
> 2) At this point reconfiguration fails (we have 2 resets) and
>   ath11k_core_reconfigure_on_crash() calls ath11k_hal_srng_deinit()
>   which destroys srng lists.  However, it does not reset per-list
>   ->initialized flag.
> 
> 3) Second ath11k_hal_dump_srng_stats() call sees stale ->initialized
>   flag and attempts to dump srng stats:
> 
>  Last interrupt received for each group:
>  ath11k_pci 0000:01:00.0: group_id 0 66785ms before
>  ath11k_pci 0000:01:00.0: group_id 1 14485062ms before
>  ath11k_pci 0000:01:00.0: group_id 2 14485062ms before
>  ath11k_pci 0000:01:00.0: group_id 3 14485062ms before
>  ath11k_pci 0000:01:00.0: group_id 4 14780845ms before
>  ath11k_pci 0000:01:00.0: group_id 5 14780845ms before
>  ath11k_pci 0000:01:00.0: group_id 6 14485062ms before
>  ath11k_pci 0000:01:00.0: group_id 7 66814ms before
>  ath11k_pci 0000:01:00.0: group_id 8 68997ms before
>  ath11k_pci 0000:01:00.0: group_id 9 67588ms before
>  ath11k_pci 0000:01:00.0: group_id 10 69511ms before
>  BUG: unable to handle page fault for address: ffffa007404eb010
>  #PF: supervisor read access in kernel mode
>  #PF: error_code(0x0000) - not-present page
>  PGD 100000067 P4D 100000067 PUD 10022d067 PMD 100b01067 PTE 0
>  Oops: 0000 [#1] PREEMPT SMP NOPTI
>  RIP: 0010:ath11k_hal_dump_srng_stats+0x2b4/0x3b0 [ath11k]
>  Call Trace:
>  <TASK>
>  ? __die_body+0xae/0xb0
>  ? page_fault_oops+0x381/0x3e0
>  ? exc_page_fault+0x69/0xa0
>  ? asm_exc_page_fault+0x22/0x30
>  ? ath11k_hal_dump_srng_stats+0x2b4/0x3b0 [ath11k (HASH:6cea 4)]
>  ath11k_qmi_driver_event_work+0xbd/0x1050 [ath11k (HASH:6cea 4)]
>  worker_thread+0x389/0x930
>  kthread+0x149/0x170
> 
> Clear per-list ->initialized flag in ath11k_hal_srng_deinit().
> 
> Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
> ---
> 
> v3:
> - updated commit message and subject line (Baochen Qiang)
> 
>  drivers/net/wireless/ath/ath11k/hal.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/hal.c b/drivers/net/wireless/ath/ath11k/hal.c
> index 8cb1505a5a0c..cab11a35f911 100644
> --- a/drivers/net/wireless/ath/ath11k/hal.c
> +++ b/drivers/net/wireless/ath/ath11k/hal.c
> @@ -1346,6 +1346,10 @@ EXPORT_SYMBOL(ath11k_hal_srng_init);
>  void ath11k_hal_srng_deinit(struct ath11k_base *ab)
>  {
>  	struct ath11k_hal *hal = &ab->hal;
> +	int i;
> +
> +	for (i = 0; i < HAL_SRNG_RING_ID_MAX; i++)
> +		ab->hal.srng_list[i].initialized = 0;
>  
>  	ath11k_hal_unregister_srng_key(ab);
>  	ath11k_hal_free_cont_rdp(ab);

Reviewed-by: Baochen Qiang <quic_bqiang@...cinc.com>