Some devices I got show an inability to operate right after power on if they are already connected. They are beyond recovery if the descriptors are requested multiple times. So in case of a timeout we rather bail early and reset again. This patch is a rework of a patch that fell through the cracks. http://www.spinics.net/lists/linux-usb/msg103263.html Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> CC: stable@xxxxxxxxxxxxxxx --- drivers/usb/core/hub.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f912fe6..2124c4e 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4496,7 +4496,12 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, r = -EPROTO; break; } - if (r == 0) + /* + * Some devices time out if they are powered on + * when already connected. They need a second + * reset. + */ + if (r == 0 || r == -ETIMEDOUT) break; } udev->descriptor.bMaxPacketSize0 = -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
