linux-kernel - [PATCH v3 2/3] tracing: clear parser->idx if parser gets nothing

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Date:   Tue, 16 Jan 2018 17:02:29 +0800
From:   changbin.du@...el.com
To:     rostedt@...dmis.org
Cc:     jolsa@...hat.com, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Changbin Du <changbin.du@...el.com>
Subject: [PATCH v3 2/3] tracing: clear parser->idx if parser gets nothing

From: Changbin Du <changbin.du@...el.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.du@...el.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