[PATCH v3 3/5] tracing: Remove unnecessary check for EVENT_FILE_FL_FREED

The event_filter_write() function calls event_file_file() to retrieve
a trace_event_file associated with a given file struct. If a non-NULL
pointer is returned, the function then checks whether the trace_event_file
instance has the EVENT_FILE_FL_FREED flag set. This check is redundant
because event_file_file() already performs this validation and returns NULL
if the flag is set. The err value is also already initialized to -ENODEV.

Remove the unnecessary check for EVENT_FILE_FL_FREED in
event_filter_write().

Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
---
 kernel/trace/trace_events.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index b659653dc03a..90915e1286da 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c

@@ -2245,12 +2245,8 @@ event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
 
 	mutex_lock(&event_mutex);
 	file = event_file_file(filp);
-	if (file) {
-		if (file->flags & EVENT_FILE_FL_FREED)
-			err = -ENODEV;
-		else
-			err = apply_event_filter(file, buf);
-	}
+	if (file)
+		err = apply_event_filter(file, buf);
 	mutex_unlock(&event_mutex);
 
 	kfree(buf);

-- 
2.53.0