Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> wrote:
>
> People trying to run Openwrt in Qemu ran into this situation where
> rtwpci->mmap is used before it's initialised:
>
> rtw89_pci_probe()
> rtw89_pci_setup_resource()
> rtw89_pci_setup_mapping()
> rtw89_pci_cfg_dac()
> rtw89_pci_config_byte_set()
> rtw89_pci_read_config_byte()
> rtw89_dbi_read8()
> rtw89_write16()
> rtw89_pci_ops_write16()
> writew(data, rtwpci->mmap + addr);
>
> Their wifi card is RTL8852BE.
>
> It looks like the problem was introduced in kernel 6.11 by commit
> 1fd4b3fe52ef ("wifi: rtw89: pci: support 36-bit PCI DMA address").
>
> This is not my bug, I'm just forwarding it from
> https://github.com/openwrt/openwrt/issues/17025.
Thanks for the report. I made and sent a patch [1].
I will also post this information on the github issue.
[1] https://lore.kernel.org/linux-wireless/20250506015356.7995-1-pkshih@xxxxxxxxxxx/T/#u
