[PATCH 3/7] trace_stat: don't increment @pos in seq start()

Li Zefan
2009-06-24T01:52:39Z

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.

[ Impact: fix missing entries when reading stat file ]

Reviewed-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
kernel/trace/trace_stat.c | 6 +-----
1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index c006437..e66f5e4 100644
--- 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;
}

--
1.5.4.rc3