From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx> Since the locking of the parent->d_inode has been moved outside the creation of the files and directories (as it use to be locked via a conditional), add a WARN_ON_ONCE() to the case that it's not locked. Link: https://lkml.kernel.org/r/20231121231112.853962542@xxxxxxxxxxx Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx> Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> (cherry picked from commit f49f950c217bfb40f11662bab39cb388d41e4cfb) --- fs/tracefs/event_inode.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c index 590e8176449b..0b90869fd805 100644 --- a/fs/tracefs/event_inode.c +++ b/fs/tracefs/event_inode.c @@ -327,6 +327,8 @@ create_file_dentry(struct eventfs_inode *ei, int idx, struct dentry **e_dentry = &ei->d_children[idx]; struct dentry *dentry; + WARN_ON_ONCE(!inode_is_locked(parent->d_inode)); + mutex_lock(&eventfs_mutex); if (ei->is_freed) { mutex_unlock(&eventfs_mutex); @@ -430,6 +432,8 @@ create_dir_dentry(struct eventfs_inode *pei, struct eventfs_inode *ei, { struct dentry *dentry = NULL; + WARN_ON_ONCE(!inode_is_locked(parent->d_inode)); + mutex_lock(&eventfs_mutex); if (pei->is_freed || ei->is_freed) { mutex_unlock(&eventfs_mutex); -- 2.43.0
