Re: [PATCH v3 1/2] mwifiex: Read a PCI register after writing the TX ring write pointer

[Kalle Valo]

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