From: Jan Schmidt <jan@xxxxxxxxxxxxxxx> commit d500c63f80f2ea08ee300e57da5f2af1c13875f5 upstream. If an endpoint is encountered that returns USB3_LPM_DEVICE_INITIATED, keep checking further endpoints, as there might be periodic endpoints later that return USB3_LPM_DISABLED due to shorter service intervals. Without this, the code can set too high a maximum-exit-latency and prevent the use of multiple USB3 cameras that should be able to work. Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Jan Schmidt <jan@xxxxxxxxxxxxxxx> Tested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/1570190373-30684-4-git-send-email-mathias.nyman@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4529,12 +4529,12 @@ static int xhci_update_timeout_for_endpo alt_timeout = xhci_call_host_update_timeout_for_endpoint(xhci, udev, desc, state, timeout); - /* If we found we can't enable hub-initiated LPM, or + /* If we found we can't enable hub-initiated LPM, and * the U1 or U2 exit latency was too high to allow - * device-initiated LPM as well, just stop searching. + * device-initiated LPM as well, then we will disable LPM + * for this device, so stop searching any further. */ - if (alt_timeout == USB3_LPM_DISABLED || - alt_timeout == USB3_LPM_DEVICE_INITIATED) { + if (alt_timeout == USB3_LPM_DISABLED) { *timeout = alt_timeout; return -E2BIG; }
