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fcst: Suppress a lockdep complaint

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===============================
 [ INFO: suspicious RCU usage. ]
 3.10.0-rc1-debug+ #1 Tainted: G           O
 -------------------------------
fcst/ft_sess.c:194 suspicious rcu_dereference_protected() usage!
    
other info that might help us debug this:
    
rcu_scheduler_active = 1, debug_locks = 0
1 lock held by fcoethread/2/7942:
 #0:  (rcu_read_lock){.+.+..}, at: [<ffffffffa035ee30>] rcu_lock_acquire.constprop.14+0x0/0x30 [fcst]

stack backtrace:
CPU: 2 PID: 7942 Comm: fcoethread/2 Tainted: G           O 3.10.0-rc1-debug+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
 0000000000000001 ffff88003b191c28 ffffffff81525a11 ffff88003b191c58
 ffffffff810a20ad ffff880039b7d1e8 ffff88003690c400 000000000000067a
 ffff880039b7cb88 ffff88003b191c80 ffffffffa035f67b ffff880039b7cb88
Call Trace:
 [<ffffffff81525a11>] dump_stack+0x19/0x1b
 [<ffffffff810a20ad>] lockdep_rcu_suspicious+0xfd/0x130
 [<ffffffffa035f67b>] ft_sess_get.isra.7+0x12b/0x150 [fcst]
 [<ffffffffa035f6e2>] ft_recv+0x42/0x100 [fcst]
 [<ffffffffa026edb2>] fc_lport_recv_req+0x272/0x2f0 [libfc]
 [<ffffffffa0268c3b>] fc_exch_recv+0x61b/0xdc0 [libfc]
 [<ffffffffa025f306>] fcoe_percpu_receive_thread+0x386/0x5f0 [fcoe]
 [<ffffffff8106d34b>] kthread+0xdb/0xe0
 [<ffffffff815357ac>] ret_from_fork+0x7c/0xb0



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4962 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2013-08-13 18:39:14 +00:00
parent e506bd990d
commit 2381497291
1 changed files with 4 additions and 0 deletions
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fcst/ft_sess.c
+4
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@@ -205,7 +205,11 @@ static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id)
struct ft_sess *sess;
rcu_read_lock();
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP], true);
#else
tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
#endif
if (!tport)
goto out;