After upgrading to r17842-b428f187f0-20211024, my R7800 2.4Ghz and 5Ghz wifi stopped working and the Luci wireless page shows Generic 802.11bg for both radios. I am using the ath10k drivers and from a bit of research, I came across a patch which seems to address the recent issue https://patchwork.kernel.org/project/linux-wireless/patch/20211020075054.23061-1-kvalo@codeaurora.org/.
This is what I see in my logs:
[ 14.166486] ath10k_pci 0000:01:00.0: assign IRQ: got 43
[ 14.167052] ath10k_pci 0000:01:00.0: enabling device (0140 -> 0142)
[ 14.167148] ath10k_pci 0000:01:00.0: enabling bus mastering
[ 14.167732] ath10k_pci 0000:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 15.140001] ath10k_pci 0000:01:00.0: qca9984/qca9994 hw1.0 target 0x01000000 chip_id 0x00000000 sub 168c:cafe
[ 15.140218] ath10k_pci 0000:01:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[ 15.155530] ath10k_pci 0000:01:00.0: firmware ver 10.4-3.9.0.2-00131 api 5 features no-p2p,mfp,peer-flow-ctrl,btcoex-param,allows-mesh-bcast,no-ps,peer-fixed-rate,iram-recovery crc32 23bd9e43
[ 17.426888] ath10k_pci 0000:01:00.0: board_file api 2 bmi_id 0:1 crc32 85498734
[ 21.085387] ath10k_pci 0000:01:00.0: failed to copy target iram contents: -12
[ 21.172940] ath10k_pci 0000:01:00.0: could not init core (-12)
[ 21.173569] ath10k_pci 0000:01:00.0: could not probe fw (-12)
[ 21.178236] ath10k_pci 0001:01:00.0: assign IRQ: got 45
[ 21.179906] ath10k_pci 0001:01:00.0: enabling device (0140 -> 0142)
[ 21.183740] ath10k_pci 0001:01:00.0: enabling bus mastering
[ 21.184702] ath10k_pci 0001:01:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 21.396114] ath10k_pci 0001:01:00.0: qca9984/qca9994 hw1.0 target 0x01000000 chip_id 0x00000000 sub 168c:cafe
[ 21.396149] ath10k_pci 0001:01:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[ 21.407102] ath10k_pci 0001:01:00.0: firmware ver 10.4-3.9.0.2-00131 api 5 features no-p2p,mfp,peer-flow-ctrl,btcoex-param,allows-mesh-bcast,no-ps,peer-fixed-rate,iram-recovery crc32 23bd9e43
[ 23.686963] ath10k_pci 0001:01:00.0: board_file api 2 bmi_id 0:2 crc32 85498734
[ 27.354454] ath10k_pci 0001:01:00.0: failed to copy target iram contents: -12
[ 27.443524] ath10k_pci 0001:01:00.0: could not init core (-12)
[ 27.444154] ath10k_pci 0001:01:00.0: could not probe fw (-12)