Jonas Dreßler [off-list ref] wrote:

On the 88W8897 PCIe+USB card the firmware randomly crashes after setting
the TX ring write pointer. The issue is present in the latest firmware
version 15.68.19.p21 of the PCIe+USB card.

Those firmware crashes can be worked around by reading any PCI register
of the card after setting that register, so read the PCI_VENDOR_ID
register here. The reason this works is probably because we keep the bus
from entering an ASPM state for a bit longer, because that's what causes
the cards firmware to crash.

This fixes a bug where during RX/TX traffic and with ASPM L1 substates
enabled (the specific substates where the issue happens appear to be
platform dependent), the firmware crashes and eventually a command
timeout appears in the logs.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=109681
Cc: stable@vger.kernel.org
Signed-off-by: Jonas Dreßler <redacted>

2 patches applied to wireless-drivers-next.git, thanks.

e5f4eb8223aa mwifiex: Read a PCI register after writing the TX ring write pointer
8e3e59c31fea mwifiex: Try waking the firmware until we get an interrupt

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211011133224.15561-2-verdre@v0yd.nl/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches