tracing: Miscellaneous fixes for trace_array ref counting

[deliverable/linux.git] / kernel / trace / trace_events.c

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7d854290bf817ef8c6b116b031830dc060ae5dc7..7a75cb22eab76150bbfae09a3189ef659d4da65f 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1218,6 +1218,7 @@ show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
 
 static int ftrace_event_avail_open(struct inode *inode, struct file *file);
 static int ftrace_event_set_open(struct inode *inode, struct file *file);
+static int ftrace_event_release(struct inode *inode, struct file *file);
 
 static const struct seq_operations show_event_seq_ops = {
        .start = t_start,
@@ -1245,7 +1246,7 @@ static const struct file_operations ftrace_set_event_fops = {
        .read = seq_read,
        .write = ftrace_event_write,
        .llseek = seq_lseek,
-       .release = seq_release,
+       .release = ftrace_event_release,
 };
 
 static const struct file_operations ftrace_enable_fops = {
@@ -1323,6 +1324,15 @@ ftrace_event_open(struct inode *inode, struct file *file,
        return ret;
 }
 
+static int ftrace_event_release(struct inode *inode, struct file *file)
+{
+       struct trace_array *tr = inode->i_private;
+
+       trace_array_put(tr);
+
+       return seq_release(inode, file);
+}
+
 static int
 ftrace_event_avail_open(struct inode *inode, struct file *file)
 {
@@ -1336,12 +1346,19 @@ ftrace_event_set_open(struct inode *inode, struct file *file)
 {
        const struct seq_operations *seq_ops = &show_set_event_seq_ops;
        struct trace_array *tr = inode->i_private;
+       int ret;
+
+       if (trace_array_get(tr) < 0)
+               return -ENODEV;
 
        if ((file->f_mode & FMODE_WRITE) &&
            (file->f_flags & O_TRUNC))
                ftrace_clear_events(tr);
 
-       return ftrace_event_open(inode, file, seq_ops);
+       ret = ftrace_event_open(inode, file, seq_ops);
+       if (ret < 0)
+               trace_array_put(tr);
+       return ret;
 }
 
 static struct event_subsystem *