[PATCH 1/2] autofs - Fix sparse warning: context imbalance in autofs4_d_automount() different lock contexts for basic block

[Ian Kent <raven@themaw.net>]

From: Peter Huewe <peterhuewe@gmx.de>

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
f55fb0c243 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>
---
 fs/autofs4/root.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 230bd2a..9bd1625 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);