Jonas Dreßler <verdre@xxxxxxx> 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@xxxxxxxxxxxxxxx > Signed-off-by: Jonas Dreßler <verdre@xxxxxxx> 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@xxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
