xhci: Prevent device initiated U1/U2 link pm if exit latency is too long

commit cd9d9491e835a845c1a98b8471f88d26285e0bb9 upstream.

If host/hub initiated link pm is prevented by a driver flag we still must
ensure that periodic endpoints have longer service intervals than link pm
exit latency before allowing device initiated link pm.

Fix this by continue walking and checking endpoint service interval if
xhci_get_timeout_no_hub_lpm() returns anything else than USB3_LPM_DISABLED

While at it fix the split line error message

Tested-by: Jan Schmidt <jan@centricular.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1570190373-30684-3-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4ffadca2c71a620c9e0979193054cfb46871cfd8..ae1c5dcceca91771c555f8e04180c756e8ef56f0 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4747,10 +4747,12 @@ static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd,
                if (intf->dev.driver) {
                        driver = to_usb_driver(intf->dev.driver);
                        if (driver && driver->disable_hub_initiated_lpm) {
-                               dev_dbg(&udev->dev, "Hub-initiated %s disabled "
-                                               "at request of driver %s\n",
-                                               state_name, driver->name);
-                               return xhci_get_timeout_no_hub_lpm(udev, state);
+                               dev_dbg(&udev->dev, "Hub-initiated %s disabled at request of driver %s\n",
+                                       state_name, driver->name);
+                               timeout = xhci_get_timeout_no_hub_lpm(udev,
+                                                                     state);
+                               if (timeout == USB3_LPM_DISABLED)
+                                       return timeout;
                        }
                }