lockd: protect nlm_blocked access in nlmsvc_retry_blocked

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / lockd / svclock.c

diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index e703318..8ebd3f5 100644 (file)
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -939,6 +939,7 @@ nlmsvc_retry_blocked(void)
        unsigned long   timeout = MAX_SCHEDULE_TIMEOUT;
        struct nlm_block *block;
 
+       spin_lock(&nlm_blocked_lock);
        while (!list_empty(&nlm_blocked) && !kthread_should_stop()) {
                block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
 
@@ -948,6 +949,7 @@ nlmsvc_retry_blocked(void)
                        timeout = block->b_when - jiffies;
                        break;
                }
+               spin_unlock(&nlm_blocked_lock);
 
                dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
                        block, block->b_when);
@@ -957,7 +959,9 @@ nlmsvc_retry_blocked(void)
                        retry_deferred_block(block);
                } else
                        nlmsvc_grant_blocked(block);
+               spin_lock(&nlm_blocked_lock);
        }
+       spin_unlock(&nlm_blocked_lock);
 
        return timeout;
 }