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

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Date:	Fri, 01 Mar 2013 19:46:40 +0800
From:	Ian Kent <raven@...maw.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	autofs mailing list <autofs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] autofs - Fix sparse warning: context imbalance in
 autofs4_d_automount() different lock contexts for basic block

From: Peter Huewe <peterhuewe@....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@...el.com>
Signed-off-by: Peter Huewe <peterhuewe@....de>
Acked-by: Ian Kent <raven@...maw.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);

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