edac,rcu: use synchronize_rcu() instead of call_rcu()+rcu_barrier()

synchronize_rcu() does the stuff as needed.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 15 deletions

diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c
index efb5d5650783..2b378207d571 100644
--- a/drivers/edac/edac_pci.c
+++ b/drivers/edac/edac_pci.c
@@ -164,19 +164,6 @@ fail1:
 }
 
 /*
- * complete_edac_pci_list_del
- *
- *      RCU completion callback to indicate item is deleted
- */
-static void complete_edac_pci_list_del(struct rcu_head *head)
-{
-        struct edac_pci_ctl_info *pci;
-
-        pci = container_of(head, struct edac_pci_ctl_info, rcu);
-        INIT_LIST_HEAD(&pci->link);
-}
-
-/*
  * del_edac_pci_from_global_list
  *
  *      remove the PCI control struct from the global list
@@ -184,8 +171,12 @@ static void complete_edac_pci_list_del(struct rcu_head *head)
 static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
 {
         list_del_rcu(&pci->link);
-        call_rcu(&pci->rcu, complete_edac_pci_list_del);
-        rcu_barrier();
+
+        /* these are for safe removal of devices from global list while
+         * NMI handlers may be traversing list
+         */
+        synchronize_rcu();
+        INIT_LIST_HEAD(&pci->link);
 }
 
 #if 0