linux-kernel - [ 74/83] NFC: Use dynamic initialization for rwlocks

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Date:	Wed, 21 Nov 2012 16:42:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Szymon Janc <szymon.janc@...to.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [ 74/83] NFC: Use dynamic initialization for rwlocks

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

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

From: Szymon Janc <szymon.janc@...to.com>

commit fe235b58d517d623bf6d40c77afca1b0ee6fc85d upstream.

If rwlock is dynamically allocated but statically initialized it is
missing proper lockdep annotation.

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
Pid: 3352, comm: neard Not tainted 3.5.0-999-nfc+ #2
Call Trace:
[<ffffffff810c8526>] __lock_acquire+0x8f6/0x1bf0
[<ffffffff81739045>] ? printk+0x4d/0x4f
[<ffffffff810c9eed>] lock_acquire+0x9d/0x220
[<ffffffff81702bfe>] ? nfc_llcp_sock_from_sn+0x4e/0x160
[<ffffffff81746724>] _raw_read_lock+0x44/0x60
[<ffffffff81702bfe>] ? nfc_llcp_sock_from_sn+0x4e/0x160
[<ffffffff81702bfe>] nfc_llcp_sock_from_sn+0x4e/0x160
[<ffffffff817034a7>] nfc_llcp_get_sdp_ssap+0xa7/0x1b0
[<ffffffff81706353>] llcp_sock_bind+0x173/0x210
[<ffffffff815d9c94>] sys_bind+0xe4/0x100
[<ffffffff8139209e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8174ea69>] system_call_fastpath+0x16/0x1b

Signed-off-by: Szymon Janc <szymon.janc@...to.com>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/nfc/llcp/llcp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -1182,8 +1182,8 @@ int nfc_llcp_register_device(struct nfc_
 		goto err_rx_wq;
 	}

-	local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock);
-	local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock);
+	rwlock_init(&local->sockets.lock);
+	rwlock_init(&local->connecting_sockets.lock);

 	nfc_llcp_build_gb(local);

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