From 3110e4006ca9652276c2e17443949bcba7dbe789 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Thu, 28 Nov 2013 19:20:04 +0100 Subject: crypto: pcrypt - Fix wrong usage of rcu_dereference() A kernel with enabled lockdep complains about the wrong usage of rcu_dereference() under a rcu_read_lock_bh() protected region. =============================== [ INFO: suspicious RCU usage. ] 3.13.0-rc1+ #126 Not tainted ------------------------------- linux/crypto/pcrypt.c:81 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 1 1 lock held by cryptomgr_test/153: #0: (rcu_read_lock_bh){.+....}, at: [] pcrypt_do_parallel.isra.2+0x5/0x200 Fix that by using rcu_dereference_bh() instead. Signed-off-by: Mathias Krause Cc: "David S. Miller" Acked-by: Steffen Klassert Signed-off-by: Herbert Xu --- crypto/pcrypt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'crypto') diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index f8c920cafe6..309d345ead9 100644 --- a/crypto/pcrypt.c +++ b/crypto/pcrypt.c @@ -78,7 +78,7 @@ static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu, cpu = *cb_cpu; rcu_read_lock_bh(); - cpumask = rcu_dereference(pcrypt->cb_cpumask); + cpumask = rcu_dereference_bh(pcrypt->cb_cpumask); if (cpumask_test_cpu(cpu, cpumask->mask)) goto out; -- cgit v1.2.3