[PATCH 00/10] wifi: ath12k: fixes for rmmod and recovery issues with hardware grouping

Aditya Kumar Singh
2025-01-09T04:25:48Z

With hardware grouping, there is a kernel crash with signature -

$ rmmod ath12k.ko
Unable to handle kernel paging request at virtual address 000000000000d1a8
[...]
Call trace:
ath12k_reg_free+0x14/0x74 [ath12k] (P)
ath12k_core_hw_group_destroy+0x7c/0xb4 [ath12k] (L)
ath12k_core_hw_group_destroy+0x7c/0xb4 [ath12k]
ath12k_core_deinit+0xd8/0x124 [ath12k]
ath12k_pci_remove+0x6c/0x130 [ath12k]
pci_device_remove+0x44/0xe8
device_remove+0x4c/0x80
device_release_driver_internal+0x1d0/0x22c
driver_detach+0x50/0x98
bus_remove_driver+0x70/0xf4
driver_unregister+0x30/0x60
pci_unregister_driver+0x24/0x9c
ath12k_pci_exit+0x18/0x24 [ath12k]
__arm64_sys_delete_module+0x1a0/0x2a8
invoke_syscall+0x48/0x110
el0_svc_common.constprop.0+0x40/0xe0
do_el0_svc+0x1c/0x28
el0_svc+0x30/0xd0
el0t_64_sync_handler+0x10c/0x138
el0t_64_sync+0x198/0x19c
Code: a9bd7bfd 910003fd a9025bf5 91402015 (f968d6a1)
---[ end trace 0000000000000000 ]---
Segmentation fault

This series aims to fix this stability issue. With this now, 100+ iteration
of rmmod and insmod works perfectly.

Also, firmware recovery with grouping is not working fine. Randomly, some
NULL pointer crash or another firmware assert is seen. This series aims to
fix that as well.

With this in place now, 100+ iteration of firmware recovery with one 3 link
AP MLD up works fine.

---
Aditya Kumar Singh (10):
wifi: ath12k: prevent race condition in ath12k_core_hw_group_destroy()
wifi: ath12k: add reference counting for core attachment to hardware group
wifi: ath12k: fix failed to set mhi state error during reboot with hardware grouping
wifi: ath12k: fix firmware assert during reboot with hardware grouping
wifi: ath12k: fix SLUB BUG - Object already free in ath12k_reg_free()
wifi: ath12k: fix ath12k_core_pre_reconfigure_recovery() with grouping
wifi: ath12k: fix ATH12K_FLAG_REGISTERED flag handling
wifi: ath12k: handle ath12k_core_restart() with hardware grouping
wifi: ath12k: handle ath12k_core_reset() with hardware grouping
wifi: ath12k: reset MLO global memory during recovery

drivers/net/wireless/ath/ath12k/core.c | 115 ++++++++++++++++++++++++++++++---
drivers/net/wireless/ath/ath12k/core.h | 18 +-----
drivers/net/wireless/ath/ath12k/mac.c | 6 +-
drivers/net/wireless/ath/ath12k/pci.c | 28 +++++++-
drivers/net/wireless/ath/ath12k/qmi.c | 24 ++++++-
drivers/net/wireless/ath/ath12k/qmi.h | 4 +-
drivers/net/wireless/ath/ath12k/reg.c | 8 ++-
drivers/net/wireless/ath/ath12k/wmi.c | 4 +-
8 files changed, 173 insertions(+), 34 deletions(-)
---
base-commit: dbe50a7420e22954c747e79e72df2750d795ea77
change-id: 20241218-fix_reboot_issues_with_hw_grouping-0c2d367a587b