btqca: crash with linux-next on bt power down

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Hi,

On Qualcomm Dragonboard 820c (APQ8096, QCA6174) soon after the boot I
observe the following crash:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=000000010da63000
[0000000000000018] pgd=080000010da62003, p4d=080000010da62003, pud=080000010da61003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in: hci_uart btqca
CPU: 2 UID: 0 PID: 66 Comm: kworker/u19:0 Not tainted 6.10.0-next-20240726-13923-gd3ce7ebd61f9-dirty #2722
Hardware name: Qualcomm Technologies, Inc. DB820c (DT)
Workqueue: hci0 hci_power_off
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : qca_power_shutdown+0x8c/0x210 [hci_uart]
lr : qca_power_shutdown+0x7c/0x210 [hci_uart]
sp : ffff8000836f3c50
x29: ffff8000836f3c50 x28: ffff00008337b900 x27: ffff000084085000
x26: 0000000000000000 x25: 0000000000000000 x24: ffff00009276f800
x23: ffff00009276f918 x22: ffff000081e1fc80 x21: 0000000000000001
x20: ffff000081e1fc80 x19: ffff00009276f800 x18: ffff0000de422170
x17: 0000000000061d88 x16: 0000000000000000 x15: 0000000000000001
x14: ffff0000813b3580 x13: 0000000000000000 x12: 00000000000001a0
x11: 0000000000000001 x10: 00000000000013f0 x9 : 0000000000000000
x8 : ffff8000836f3b40 x7 : 0000000000000000 x6 : ffff800080d52e88
x5 : 0000000000000000 x4 : ffff8000836f0000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : ffff00008f56d000 x0 : 0000000000000000
Call trace:
 qca_power_shutdown+0x8c/0x210 [hci_uart]
 qca_power_off+0x70/0xfb8 [hci_uart]
 hci_dev_close_sync+0x4b0/0x6d8
 hci_power_off+0x2c/0x44
 process_one_work+0x20c/0x62c
 worker_thread+0x1bc/0x36c
 kthread+0x120/0x124
 ret_from_fork+0x10/0x20
Code: f9400681 b4000441 f9403c36 f94102c0 (f9400c00)
---[ end trace 0000000000000000 ]---


-- 
With best wishes
Dmitry




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