Dear Mathias,
Am 23.02.24 um 00:33 schrieb Mathias Nyman:
Unused USB ports may have bogus location data in ACPI PLD tables.
This causes port peering failures as these unused USB2 and USB3 ports
location may match.
Due to these failures the driver prints a
"usb: port power management may be unreliable" warning, and
unnecessarily blocks port power off during runtime suspend.
This was debugged on a couple DELL systems where the unused ports
all returned zeroes in their location data.
Similar bugreports exist for other systems.
Don't try to peer or match ports that have connect type set to
USB_PORT_NOT_USED.
Fixes: 3bfd659baec8 ("usb: find internal hub tier mismatch via acpi")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218465
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218486
Tested-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-usb/5406d361-f5b7-4309-b0e6-8c94408f7d75@xxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # v3.16+
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
[…]
I was able to successfully test it on the Dell PowerEdge T440, and the
warning is gone there too.
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218490
Kind regards,
Paul
