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

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commit cd9d9491e8 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>
This commit is contained in:
Mathias Nyman
2019-10-04 14:59:27 +03:00
committed by Greg Kroah-Hartman
parent 077855ba2d
commit faa0502a5b
1 changed files with 6 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/usb/host/xhci.c
View File

@@ -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;
}
}