ath10k kernel panic on boot

[Nick Marriott]

I have a QCA9888 Compex WLE650V5-18 that runs just fine on i386 kernels but ath10k seems to be causing a kernel panic on boot with x86_64 kernels.  Log is below.  I've tried multiple firmware versions from kvalo and candelatech but my google-fu couldn’t find a solution.  Any thoughts or suggestions?

[   14.503715] ath10k_pci 0000:04:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[   14.634112] ath10k_pci 0000:04:00.0: qca9888 hw2.0 target 0x01000000 chip_id 0x00000000 sub 0000:0000
[   14.643448] ath10k_pci 0000:04:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 0 testmode 0
[   14.652937] ath10k_pci 0000:04:00.0: firmware ver 10.4-3.2-00072 api 5 features no-p2p,mfp,peer-flow-ctrl crc32 b1da0716
[   16.671594] ath10k_pci 0000:04:00.0: board_file api 2 bmi_id 0:17 crc32 74a04250

[   20.133039] swiotlb_tbl_map_single: 9 callbacks suppressed
[   20.138705] ath10k_pci 0000:04:00.0: swiotlb buffer is full (sz: 461288 bytes)
[   20.145992] ath10k_pci 0000:04:00.0: DMA: Out of SW-IOMMU space for 461288 bytes
[   20.153397] Kernel panic - not syncing: DMA: Random memory could be DMA accessed
[   20.153397] 
[   20.162273] CPU: 0 PID: 106 Comm: kworker/u4:2 Not tainted 4.12.8-300.fc26.x86_64 #1
[   20.170014] Hardware name: PC Engines APU/APU, BIOS 4.0 09/08/2014
[   20.176267] Workqueue: ath10k_aux_wq ath10k_wmi_event_service_ready_work [ath10k_core]
[   20.184229] Call Trace:
[   20.186698]  dump_stack+0x63/0x90
[   20.190027]  panic+0xe4/0x22d
[   20.193004]  swiotlb_full+0xa3/0xb0
[   20.196502]  swiotlb_map_page+0x12f/0x140
[   20.200537]  ath10k_wmi_event_service_ready_work+0x3b1/0x6b0 [ath10k_core]
[   20.207422]  process_one_work+0x193/0x3c0
[   20.211443]  worker_thread+0x4a/0x3a0
[   20.215119]  kthread+0x125/0x140
[   20.218359]  ? process_one_work+0x3c0/0x3c0
[   20.222551]  ? kthread_park+0x60/0x60
[   20.226227]  ret_from_fork+0x25/0x30
[   20.229829] Kernel Offset: 0xe000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[   20.240522] ---[ end Kernel panic - not syncing: DMA: Random memory could be DMA accessed
[   20.240522]