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When transfer type is isochronous, the other bits (bits 5..2) of bmAttributes in endpoint descriptor might not be set zero. So it's better to use usb_endpoint_type routine to mask bmAttributes with USB_ENDPOINT_XFERTYPE_MASK to judge the transfter type later. Signed-off-by: Huang Rui <ray.huang@amd.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>