IB/ehca: Fix improper use of yield() with spinlock held

Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
index 93995b658d94..6074c897f51c 100644
--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -344,8 +344,11 @@ int ehca_destroy_cq(struct ib_cq *cq)
         unsigned long flags;
 
         spin_lock_irqsave(&ehca_cq_idr_lock, flags);
-        while (my_cq->nr_callbacks)
+        while (my_cq->nr_callbacks) {
+                spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
                 yield();
+                spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+        }
 
         idr_remove(&ehca_cq_idr, my_cq->token);
         spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);