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/kernel/padata.c:115 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: [<ffffffff8115c235>] padata_do_parallel+0x5/0x270
Fix that by using rcu_dereference_bh() instead.
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
---
kernel/padata.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/padata.c b/kernel/padata.c
index 2abd25d79c..161402f0b5 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -112,7 +112,7 @@ int padata_do_parallel(struct padata_instance *pinst,
rcu_read_lock_bh();
- pd = rcu_dereference(pinst->pd);
+ pd = rcu_dereference_bh(pinst->pd);
err = -EINVAL;
if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID)
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
