linux-kernel - [ 47/48] tcm_fc: Resolve suspicious RCU usage warnings

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Message-Id: <20120709143123.361976495@decadent.org.uk>
Date:	Mon, 09 Jul 2012 15:32:03 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mark Rustad <mark.d.rustad@...el.com>,
	Ross Brattain <ross.b.brattain@...el.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [ 47/48] tcm_fc: Resolve suspicious RCU usage warnings

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

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

From: Mark Rustad <mark.d.rustad@...el.com>

commit 863555be0c81558b1af277addcf68acb8f778860 upstream.

Use rcu_dereference_protected to tell rcu that the ft_lport_lock
is held during ft_lport_create. This resolved "suspicious RCU usage"
warnings when debugging options are turned on.

Signed-off-by: Mark Rustad <mark.d.rustad@...el.com>
Tested-by: Ross Brattain <ross.b.brattain@...el.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/tcm_fc/tfc_sess.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/target/tcm_fc/tfc_sess.c b/drivers/target/tcm_fc/tfc_sess.c
index cb99da9..87901fa 100644
--- a/drivers/target/tcm_fc/tfc_sess.c
+++ b/drivers/target/tcm_fc/tfc_sess.c
@@ -58,7 +58,8 @@ static struct ft_tport *ft_tport_create(struct fc_lport *lport)
 	struct ft_tport *tport;
 	int i;
 
-	tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
+	tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
+					  lockdep_is_held(&ft_lport_lock));
 	if (tport && tport->tpg)
 		return tport;
 


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