linux-kernel - [PATCH 1/4] ftrace: Simplify glob handling in unregister_ftrace_function_probe

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Message-Id: <95a1ae9c5dc472fa8b23c0f2ce0ad8276f35d30e.1494702964.git.naveen.n.rao@linux.vnet.ibm.com>
Date:   Sun, 14 May 2017 01:01:01 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>, Shuah Khan <shuah@...nel.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH 1/4] ftrace: Simplify glob handling in unregister_ftrace_function_probe_func()

Handle a NULL glob properly.

Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 kernel/trace/ftrace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 39dca4e86a94..28dc824ad072 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4144,9 +4144,9 @@ unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
 	int i, ret = -ENODEV;
 	int size;
 
-	if (glob && (strcmp(glob, "*") == 0 || !strlen(glob)))
+	if (!glob || (glob && (strcmp(glob, "*") == 0 || !strlen(glob))))
 		func_g.search = NULL;
-	else if (glob) {
+	else {
 		int not;
 
 		func_g.type = filter_parse_regex(glob, strlen(glob),
-- 
2.12.2