PCI: Mark Atheros AR93xx to avoid bus reset
authorAlex Williamson <alex.williamson@redhat.com>
Fri, 16 Jan 2015 00:17:12 +0000 (18:17 -0600)
committerBjorn Helgaas <bhelgaas@google.com>
Fri, 16 Jan 2015 16:04:38 +0000 (10:04 -0600)
commitc3e59ee4e76686b0c84ca8faa1011d10cd4ca1b8
tree3ef6554ce5777caaa1eb1bada2edab879010e716
parentf331a859e0ee5a898c1f47596eddad4c4f02d657
PCI: Mark Atheros AR93xx to avoid bus reset

Reports against the TL-WDN4800 card indicate that PCI bus reset of this
Atheros device cause system lock-ups and resets.  I've also been able to
confirm this behavior on multiple systems.  The device never returns from
reset and attempts to access config space of the device after reset result
in hangs.  Blacklist bus reset for the device to avoid this issue.

[bhelgaas: This regression appeared in v3.14.  Andreas bisected it to
425c1b223dac ("PCI: Add Virtual Channel to save/restore support"), but we
don't understand the mechanism by which that commit affects the reset
path.]

[bhelgaas: changelog, references]
Link: http://lkml.kernel.org/r/20140923210318.498dacbd@dualc.maya.org
Reported-by: Andreas Hartmann <andihartmann@freenet.de>
Tested-by: Andreas Hartmann <andihartmann@freenet.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v3.14+
drivers/pci/quirks.c