An USB 1.1 keyboard connected to dwc2 through a high-speed hub does not report status until it changes. With this patch you can enable keyboard by pressing a key while USB devices are probed. Without a keypress no state is reported and the probe times out. We don't want to wait for a keypress or timeout while polling for keypresses so implement an int_msg nonblock variant that exits early on error.
Signed-off-by: Michal Suchanek msuchanek@suse.de --- v2: move superfluous hunk to earlier patch --- drivers/usb/host/dwc2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index b4121a49b805..78829d56199c 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -1123,7 +1123,7 @@ int _submit_int_msg(struct dwc2_priv *priv, struct usb_device *dev, return -ETIMEDOUT; } ret = _submit_bulk_msg(priv, dev, pipe, buffer, len); - if (ret != -EAGAIN) + if ((ret != -EAGAIN) || nonblock) return ret; } }