tracing: tprobe-events: Fix to put tracepoint_user when disable the tprobe

__unregister_trace_fprobe() checks tf->tuser to put it when removing
tprobe. However, disable_trace_fprobe() does not use it and only calls
unregister_fprobe(). Thus it forgets to disable tracepoint_user.

If the trace_fprobe has tuser, put it for unregistering the tracepoint
callbacks when disabling tprobe correctly.

Link: https://lore.kernel.org/all/176244794466.155515.3971904050506100243.stgit@devnote2/

Fixes: 2867495 ("tracing: tprobe-events: Register tracepoint when enable tprobe event")
Cc: [email protected]
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Tested-by: Beau Belgrave <[email protected]>
Reviewed-by: Beau Belgrave <[email protected]>

Author: mhiramat

kernel/trace/trace_fprobe.c

@@ -1514,6 +1514,10 @@ static int disable_trace_fprobe(struct trace_event_call *call,
 	if (!trace_probe_is_enabled(tp)) {
 		list_for_each_entry(tf, trace_probe_probe_list(tp), tp.list) {
 			unregister_fprobe(&tf->fp);
+			if (tf->tuser) {
+				tracepoint_user_put(tf->tuser);
+				tf->tuser = NULL;
+			}
 		}
 	}