[PATCH ath-next v2] wifi: ath12k: Prevent sending WMI commands to firmware during firmware crash

[Vasanthakumar Thiagarajan]

On 4/16/2025 7:34 AM, Maharaja Kennadyrajan wrote:
> Currently, we encounter the following kernel call trace when a firmware
> crash occurs. This happens because the host sends WMI commands to the
> firmware while it is in recovery, causing the commands to fail and
> resulting in the kernel call trace.
> 
> Set the ATH12K_FLAG_CRASH_FLUSH and ATH12K_FLAG_RECOVERY flags when the
> host driver receives the firmware crash notification from MHI. This
> prevents sending WMI commands to the firmware during recovery.
> 
> Call Trace:
>   <TASK>
>   dump_stack_lvl+0x75/0xc0
>   register_lock_class+0x6be/0x7a0
>   ? __lock_acquire+0x644/0x19a0
>   __lock_acquire+0x95/0x19a0
>   lock_acquire+0x265/0x310
>   ? ath12k_ce_send+0xa2/0x210 [ath12k]
>   ? find_held_lock+0x34/0xa0
>   ? ath12k_ce_send+0x56/0x210 [ath12k]
>   _raw_spin_lock_bh+0x33/0x70
>   ? ath12k_ce_send+0xa2/0x210 [ath12k]
>   ath12k_ce_send+0xa2/0x210 [ath12k]
>   ath12k_htc_send+0x178/0x390 [ath12k]
>   ath12k_wmi_cmd_send_nowait+0x76/0xa0 [ath12k]
>   ath12k_wmi_cmd_send+0x62/0x190 [ath12k]
>   ath12k_wmi_pdev_bss_chan_info_request+0x62/0xc0 [ath1
>   ath12k_mac_op_get_survey+0x2be/0x310 [ath12k]
>   ieee80211_dump_survey+0x99/0x240 [mac80211]
>   nl80211_dump_survey+0xe7/0x470 [cfg80211]
>   ? kmalloc_reserve+0x59/0xf0
>   genl_dumpit+0x24/0x70
>   netlink_dump+0x177/0x360
>   __netlink_dump_start+0x206/0x280
>   genl_family_rcv_msg_dumpit.isra.22+0x8a/0xe0
>   ? genl_family_rcv_msg_attrs_parse.isra.23+0xe0/0xe0
>   ? genl_op_lock.part.12+0x10/0x10
>   ? genl_dumpit+0x70/0x70
>   genl_rcv_msg+0x1d0/0x290
>   ? nl80211_del_station+0x330/0x330 [cfg80211]
>   ? genl_get_cmd_both+0x50/0x50
>   netlink_rcv_skb+0x4f/0x100
>   genl_rcv+0x1f/0x30
>   netlink_unicast+0x1b6/0x260
>   netlink_sendmsg+0x31a/0x450
>   __sock_sendmsg+0xa8/0xb0
>   ____sys_sendmsg+0x1e4/0x260
>   ___sys_sendmsg+0x89/0xe0
>   ? local_clock_noinstr+0xb/0xc0
>   ? rcu_is_watching+0xd/0x40
>   ? kfree+0x1de/0x370
>   ? __sys_sendmsg+0x7a/0xc0
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1
> 
> Fixes: a9b46dd2e483 ("wifi: ath12k: Add firmware coredump collection support")
> Signed-off-by: Maharaja Kennadyrajan <maharaja.kennadyrajan at oss.qualcomm.com>

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan at oss.qualcomm.com>