ftrace: Have unregister_ftrace_function_probe_func() return a value

Currently unregister_ftrace_function_probe_func() is a void function. It
does not give any feedback if an error occurred or no item was found to
remove and nothing was done.

Change it to return status and success if it removed something. Also update
the callers to return that feedback to the user.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 56d0fe1e4ea1..dcb4d37ed4bd 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -586,10 +586,8 @@ ftrace_trace_probe_callback(struct ftrace_probe_ops *ops,
         if (!enable)
                 return -EINVAL;
 
-        if (glob[0] == '!') {
-                unregister_ftrace_function_probe_func(glob+1, ops);
-                return 0;
-        }
+        if (glob[0] == '!')
+                return unregister_ftrace_function_probe_func(glob+1, ops);
 
         if (!param)
                 goto out_reg;