linux-kernel - [PATCH 2/2] lockdep: annotate bcsp driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 30 Oct 2006 10:06:32 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Jiri Kosina <jikos@...os.cz>,
	Marcel Holtmann <marcel@...tmann.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 2/2] lockdep: annotate bcsp driver


=============================================
[ INFO: possible recursive locking detected ]
2.6.18-1.2699.fc6 #1
---------------------------------------------
swapper/0 is trying to acquire lock:
 (&list->lock#3){+...}, at: [<c05ad307>] skb_dequeue+0x12/0x43

but task is already holding lock:
 (&list->lock#3){+...}, at: [<df98cd79>] bcsp_dequeue+0x6a/0x11e [hci_uart]


Two different list locks nest, annotate so.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 drivers/bluetooth/hci_bcsp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/bluetooth/hci_bcsp.c
===================================================================
--- linux-2.6.orig/drivers/bluetooth/hci_bcsp.c
+++ linux-2.6/drivers/bluetooth/hci_bcsp.c
@@ -330,7 +330,7 @@ static struct sk_buff *bcsp_dequeue(stru
 	   reliable packet if the number of packets sent but not yet ack'ed
 	   is < than the winsize */
 
-	spin_lock_irqsave(&bcsp->unack.lock, flags);
+	spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING);
 
 	if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) {
 		struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type);


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/