ftrace: Update filter when tracing enabled in set_ftrace_filter()

commit 072126f4529196f71a97960248bca54fd4554c2d upstream.

Currently, if set_ftrace_filter() is called when the ftrace_ops is
active, the function filters will not be updated. They will only be updated
when tracing is disabled and re-enabled.

Update the functions immediately during set_ftrace_filter().

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1eef6cf38d5..6b1e596bd3a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2901,6 +2901,10 @@ ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len,
 
         mutex_lock(&ftrace_lock);
         ret = ftrace_hash_move(ops, enable, orig_hash, hash);
+        if (!ret && ops->flags & FTRACE_OPS_FL_ENABLED
+            && ftrace_enabled)
+                ftrace_run_update_code(FTRACE_ENABLE_CALLS);
+
         mutex_unlock(&ftrace_lock);
 
         mutex_unlock(&ftrace_regex_lock);