Hi, thanks for the patch. I applied the patch on linux master and it fixed the issue. shell output: $ ./a.out /dev/usb_gadget/aio_simple_test Event BIND Event ENABLE submit: in submit: out Event SUSPEND Event DISABLE Event ENABLE ev=in; ret=2112 ev=out; ret=0 submit: in submit: out Event SUSPEND Event DISABLE -- 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