[PATCH v2 2/3] tracing: clear parser->idx if parser gets nothing

[changbin . du]

From: Changbin Du <changbin...@intel.com>

If only spaces was got in that cycle, we should clear parser->idx to make
trace_parser_loaded() return false.

Signed-off-by: Changbin Du <changbin...@intel.com>
---
 kernel/trace/trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 144d08e..b44926e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1236,14 +1236,14 @@ int trace_get_user(struct trace_parser *parser, const 
char __user *ubuf,
                        cnt--;
                }
 
+               parser->idx = 0;
+
                /* only spaces were written */
                if (isspace(ch) || !ch) {
                        *ppos += read;
                        ret = read;
                        goto out;
                }
-
-               parser->idx = 0;
        }
 
        /* read the non-space input */
-- 
2.7.4