netdev - [PATCH 6/6] IrDA: Lockdep annotation for hashbin locks

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Message-ID: <20070314192519.GH3397@sortiz.org>
Date:	Wed, 14 Mar 2007 21:25:19 +0200
From:	Samuel Ortiz <samuel@...tiz.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, irda-users@...ts.sourceforge.net,
	davej@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] IrDA: Lockdep annotation for hashbin locks

Rmmoding irda triggers a lockdep false positive. We can fix that by assigning
each hashbin lock to a separate class.

Reported-by: Dave Jones <davej@...hat.com>
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
---
 include/net/irda/irqueue.h |    1 +
 net/irda/irqueue.c         |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/net/irda/irqueue.h b/include/net/irda/irqueue.h
index 335b0ac..67cb434 100644
--- a/include/net/irda/irqueue.h
+++ b/include/net/irda/irqueue.h
@@ -71,6 +71,7 @@ typedef struct hashbin_t {
 	int        hb_size;
 	spinlock_t hb_spinlock;		/* HB_LOCK - Can be used by the user */
 
+	struct lock_class_key hb_lock_key;
 	irda_queue_t* hb_queue[HASHBIN_SIZE] IRDA_ALIGN;
 
 	irda_queue_t* hb_current;
diff --git a/net/irda/irqueue.c b/net/irda/irqueue.c
index 9266233..2871a8a 100644
--- a/net/irda/irqueue.c
+++ b/net/irda/irqueue.c
@@ -370,6 +370,7 @@ hashbin_t *hashbin_new(int type)
 	/* Make sure all spinlock's are unlocked */
 	if ( hashbin->hb_type & HB_LOCK ) {
 		spin_lock_init(&hashbin->hb_spinlock);
+		lockdep_set_class(&hashbin->hb_spinlock, &hashbin->hb_lock_key);
 	}
 
 	return hashbin;
-- 
1.5.0.2

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