linux/drivers/net/wireless/marvell
Jonas Dreßler e5f4eb8223 mwifiex: Read a PCI register after writing the TX ring write pointer
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 <verdre@v0yd.nl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211011133224.15561-2-verdre@v0yd.nl
2021-10-18 15:29:51 +03:00
..
libertas libertas: Remove unnecessary label of lbs_ethtool_get_eeprom 2021-08-01 13:28:55 +03:00
libertas_tf libertas_tf: Fix wrong function name in comments 2021-06-15 16:10:45 +03:00
mwifiex mwifiex: Read a PCI register after writing the TX ring write pointer 2021-10-18 15:29:51 +03:00
Kconfig
Makefile
mwl8k.c mwl8k: Avoid memcpy() over-reading of mcs.rx_mask 2021-06-22 18:23:54 +03:00