linux-kernel - [PATCH 3.18 01/20] [PATCH] Revert "ceph: unlock dangling spinlock in try_flush

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Message-Id: <20171116172721.824380197@linuxfoundation.org>
Date:   Thu, 16 Nov 2017 18:28:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeff Layton <jlayton@...hat.com>,
        "Yan, Zheng" <zyan@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        kbuild test robot <fengguang.wu@...el.com>
Subject: [PATCH 3.18 01/20] [PATCH] Revert "ceph: unlock dangling spinlock in try_flush_caps()"

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

This reverts commit 55d4aa12af57ea7782f0c8bbc3b01e44673b05ba which is
commit 6c2838fbdedb9b72a81c931d49e56b229b6cdbca upstream.

The locking issue was not a problem in 3.18, and now sparse rightly
complains about this being an issue, so go back to the "correct" code.

Cc: Jeff Layton <jlayton@...hat.com>
Cc: "Yan, Zheng" <zyan@...hat.com>
Cc: Ilya Dryomov <idryomov@...il.com>
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ceph/caps.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1748,7 +1748,6 @@ static int try_flush_caps(struct inode *
 retry:
 	spin_lock(&ci->i_ceph_lock);
 	if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
-		spin_unlock(&ci->i_ceph_lock);
 		dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
 		goto out;
 	}
@@ -1766,10 +1765,8 @@ retry:
 			mutex_lock(&session->s_mutex);
 			goto retry;
 		}
-		if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
-			spin_unlock(&ci->i_ceph_lock);
+		if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
 			goto out;
-		}
 
 		flushing = __mark_caps_flushing(inode, session);