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Subject[PATCH 3.16 70/99] tracing: Fix tracing_stat return values in error handling paths
3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Luis Henriques <luis.henriques@canonical.com>

commit afccc00f75bbbee4e4ae833a96c2d29a7259c693 upstream.

tracing_stat_init() was always returning '0', even on the error paths. It
now returns -ENODEV if tracing_init_dentry() fails or -ENOMEM if it fails
to created the 'trace_stat' debugfs directory.

Link: http://lkml.kernel.org/r/1410299381-20108-1-git-send-email-luis.henriques@canonical.com

Fixes: ed6f1c996bfe4 ("tracing: Check return value of tracing_init_dentry()")
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
kernel/trace/trace_stat.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -277,19 +277,23 @@ static int tracing_stat_init(void)

d_tracing = tracing_init_dentry();
if (!d_tracing)
- return 0;
+ return -ENODEV;

stat_dir = debugfs_create_dir("trace_stat", d_tracing);
- if (!stat_dir)
+ if (!stat_dir) {
pr_warning("Could not create debugfs "
"'trace_stat' entry\n");
+ return -ENOMEM;
+ }
return 0;
}

static int init_stat_file(struct stat_session *session)
{
- if (!stat_dir && tracing_stat_init())
- return -ENODEV;
+ int ret;
+
+ if (!stat_dir && (ret = tracing_stat_init()))
+ return ret;

session->file = debugfs_create_file(session->ts->name, 0644,
stat_dir,
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