trace_stat: Don't increment @pos in seq start()

It's wrong to increment @pos in stat_seq_start(). It causes some
stat entries lost when reading stat file, if the output of the file
is larger than PAGE_SIZE.

Reviewed-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A418716.90209@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index c006437..e66f5e4 100644 (file)
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -199,17 +199,13 @@ static void *stat_seq_start(struct seq_file *s, loff_t *pos)
        mutex_lock(&session->stat_mutex);
 
        /* If we are in the beginning of the file, print the headers */
-       if (!*pos && session->ts->stat_headers) {
-               (*pos)++;
+       if (!*pos && session->ts->stat_headers)
                return SEQ_START_TOKEN;
-       }
 
        node = rb_first(&session->stat_root);
        for (i = 0; node && i < *pos; i++)
                node = rb_next(node);
 
-       (*pos)++;
-
        return node;
 }