Dear Mathias,
Thank you for version 2.
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@molgen.mpg.de Link: https://lore.kernel.org/linux-usb/5406d361-f5b7-4309-b0e6-8c94408f7d75@molge... Cc: stable@vger.kernel.org # v3.16+ Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com
v1 -> v2
- Improve commit message
- Add missing Fixes, Closes and Link tags
- send this patch separately for easier picking to usb-linus
drivers/usb/core/port.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index c628c1abc907..4d63496f98b6 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -573,7 +573,7 @@ static int match_location(struct usb_device *peer_hdev, void *p) struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev); struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
- if (!peer_hub)
- if (!peer_hub || port_dev->connect_type == USB_PORT_NOT_USED) return 0;
hcd = bus_to_hcd(hdev->bus); @@ -584,7 +584,8 @@ static int match_location(struct usb_device *peer_hdev, void *p) for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) { peer = peer_hub->ports[port1 - 1];
if (peer && peer->location == port_dev->location) {
if (peer && peer->connect_type != USB_PORT_NOT_USED &&peer->location == port_dev->location) { link_peers_report(port_dev, peer); return 1; /* done */
I tested the two versions from before
8c849968dd165 usb: port: Don't try to peer unused USB ports based on location 85704eb36e9f2 usb: usb-acpi: Set port connect type of not connectable ports correctly 39133352cbed6 Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
on the Dell OptiPlex 5055 [1], but the USB keyboard and mouse were not detected. I have to find out, if I screwed up the build – as network also did not work –, but please wait until I get that test finished. On the bright side, the warning was gone. ;-)
With 6.8-rc5 and the two patches:
[ 2.020312] usbcore: registered new interface driver usbfs [ 2.021303] usbcore: registered new interface driver hub [ 2.022307] usbcore: registered new device driver usb [ 3.219725] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM. [ 3.285546] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM. [ 3.301819] usbcore: registered new interface driver usb-storage [ 3.630824] usb 1-7: new low-speed USB device number 2 using xhci_hcd [ 4.120826] usb 1-10: new low-speed USB device number 3 using xhci_hcd
With 6.6.12 and without your patches:
[ 2.746693] usbcore: registered new interface driver usbfs [ 2.751684] usbcore: registered new interface driver hub [ 2.756686] usbcore: registered new device driver usb [ 4.095689] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM. [ 4.116406] usb: port power management may be unreliable [ 4.182389] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM. [ 4.203353] usbcore: registered new interface driver usb-storage [ 4.417466] usb 1-7: new low-speed USB device number 2 using xhci_hcd [ 4.918470] usb 1-10: new low-speed USB device number 3 using xhci_hcd [ 13.184956] usbcore: registered new interface driver usbhid [ 13.191508] usbhid: USB HID core driver [ 13.333554] input: Dell Dell USB Entry Keyboard as /devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-7/1-7:1.0/0003:413C:2107.0001/input/input8 [ 13.421779] hid-generic 0003:413C:2107.0001: input,hidraw0: USB HID v1.10 Keyboard [Dell Dell USB Entry Keyboard] on usb-0000:01:00.0-7/input0 [ 13.446542] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-10/1-10:1.0/0003:046D:C050.0002/input/input11 [ 13.473113] hid-generic 0003:046D:C050.0002: input,hidraw1: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:01:00.0-10/input0