wifi: rtw89: fix proceeding MCC with wrong scanning state after sequence changes

When starting/proceeding MCC, it will abort an ongoing hw scan process.
In the proceeding cases, it unexpectedly tries to abort a non-exist hw
scan process. Then, a trace shown at the bottom will happen. This problem
is caused by a previous commit which changed some call sequence inside
rtw89_hw_scan_complete() to fix some coex problems. These changes lead
to our scanning flag was not cleared when proceeding MCC. To keep the
fixes on coex, and resolve the problem here, re-consider the related
call sequence.

The known sequence requirements are listed below.

* the old sequence:
	A. notify coex
	B. clear scanning flag
	C. proceed chanctx
		C-1. set channel
		C-2. proceed MCC
(the problem: A needs to be after C-1)

* the current sequence:
	C. proceed chanctx
		C-1. set channel
		C-2. proceed MCC
	A. notify coex
	B. clear scanning flag
(the problem: C-2 needs to be after B)

So, now let hw scan caller pass a callback to proceed chanctx if needed.
Then, the new sequence will be like the below.
	C-1. set channel
	A. notify coex
	B. clear scanning flag
	C-2. proceed MCC

The following is the kernel log for the problem in current sequence.

rtw89_8852be 0000:04:00.0: rtw89_hw_scan_offload failed ret -110
------------[ cut here ]------------
[...]
CPU: 2 PID: 3991 Comm: kworker/u16:0 Tainted: G           OE      6.6.17 #3
Hardware name: LENOVO 2356AD1/2356AD1, BIOS G7ETB3WW (2.73 ) 11/28/2018
Workqueue: events_unbound wiphy_work_cancel [cfg80211]
RIP: 0010:ieee80211_sched_scan_stopped+0xaea/0xd80 [mac80211]
Code: 9c 24 d0 11 00 00 49 39 dd 0f 85 46 ff ff ff 4c 89 e7 e8 09 2d
RSP: 0018:ffffb27783643d48 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8a2280964bc0 RSI: 0000000000000000 RDI: ffff8a23df580900
RBP: ffffb27783643d88 R08: 0000000000000001 R09: 0000000000000400
R10: 0000000000000000 R11: 0000000000008268 R12: ffff8a23df580900
R13: ffff8a23df581b00 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8a258e680000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f26a0654000 CR3: 000000002ea2e002 CR4: 00000000001706e0
Call Trace:
 <TASK>
 ? show_regs+0x68/0x70
 ? ieee80211_sched_scan_stopped+0xaea/0xd80 [mac80211]
 ? __warn+0x8f/0x150
 ? ieee80211_sched_scan_stopped+0xaea/0xd80 [mac80211]
 ? report_bug+0x1f5/0x200
 ? handle_bug+0x46/0x80
 ? exc_invalid_op+0x19/0x70
 ? asm_exc_invalid_op+0x1b/0x20
 ? ieee80211_sched_scan_stopped+0xaea/0xd80 [mac80211]
 ieee80211_scan_work+0x14a/0x650 [mac80211]
 ? __queue_work+0x10f/0x410
 wiphy_work_cancel+0x2fb/0x310 [cfg80211]
 process_scheduled_works+0x9d/0x390
 ? __pfx_worker_thread+0x10/0x10
 worker_thread+0x15b/0x2d0
 ? __pfx_worker_thread+0x10/0x10
 kthread+0x108/0x140
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x3c/0x60
 ? __pfx_kthread+0x10/0x10
 ret_from_fork_asm+0x1b/0x30
 </TASK>
---[ end trace 0000000000000000 ]---

Fixes: f16c40acd319 ("wifi: rtw89: Fix TX fail with A2DP after scanning")
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20241231004811.8646-2-pkshih@realtek.com

0 files changed, 0 insertions, 0 deletions