Merge tag 'zte-defconfig64-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / drivers / infiniband / hw / qib / qib_debugfs.c

diff --git a/drivers/infiniband/hw/qib/qib_debugfs.c b/drivers/infiniband/hw/qib/qib_debugfs.c
index 5e75b43..5bad8e3 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_debugfs.c
+++ b/drivers/infiniband/hw/qib/qib_debugfs.c
@@ -189,27 +189,32 @@ static int _ctx_stats_seq_show(struct seq_file *s, void *v)
 DEBUGFS_FILE(ctx_stats)
 
 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
+       __acquires(RCU)
 {
        struct qib_qp_iter *iter;
        loff_t n = *pos;
 
-       rcu_read_lock();
        iter = qib_qp_iter_init(s->private);
+
+       /* stop calls rcu_read_unlock */
+       rcu_read_lock();
+
        if (!iter)
                return NULL;
 
-       while (n--) {
+       do {
                if (qib_qp_iter_next(iter)) {
                        kfree(iter);
                        return NULL;
                }
-       }
+       } while (n--);
 
        return iter;
 }
 
 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
                                   loff_t *pos)
+       __must_hold(RCU)
 {
        struct qib_qp_iter *iter = iter_ptr;
 
@@ -224,6 +229,7 @@ static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
 }
 
 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
+       __releases(RCU)
 {
        rcu_read_unlock();
 }