autofs - Fix sparse warning: context imbalance in autofs4_d_automount() different lock contexts for basic block

Sparse complains:

  fs/autofs4/root.c:409:9: sparse: context imbalance in 'autofs4_d_automount' - different lock contexts for basic block

This was introduced by commit f55fb0c24386 ("autofs4 - dont clear
DCACHE_NEED_AUTOMOUNT on rootless mount")

The function autofs4_d_automount can be left with the (&sbi->fs_lock)
held if sbi->version <= 4 and simple_empty(dentry) == false so the
warning seems valid.

--> Add an spin_unlock in this case before we jump to done

Unfortunately compile tested only.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 230bd2aad4f4..9bd16255dd9c 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -383,8 +383,10 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
                                 goto done;
                         }
                 } else {
-                        if (!simple_empty(dentry))
+                        if (!simple_empty(dentry)) {
+                                spin_unlock(&sbi->fs_lock);
                                 goto done;
+                        }
                 }
                 ino->flags |= AUTOFS_INF_PENDING;
                 spin_unlock(&sbi->fs_lock);