On 2022/05/02 12:49, Tetsuo Handa wrote: > @@ -153,6 +153,24 @@ struct imon_context { > const struct imon_usb_dev_descr *dev_descr; > /* device description with key */ > /* table for front panels */ > + /* > + * Fields for deferring free_imon_context(). > + * > + * Since reference to "struct imon_context" is stored into > + * "struct file_operations"->private_data, we need to remember Oops. This is "struct file"->private_data. Please correct when applying. ;-) > + * how many file descriptors might access this "struct imon_context". > + */ > + refcount_t users;