RDMA/nes: Check cqp_avail_reqs is empty after locking the list

Between the first empty list check and locking the list, the list can
change.  Check it again after it is locked to make sure the list is
still not empty.
Signed-off-by: NFaisal Latif <faisal.latif@intel.com>
Signed-off-by: NChien Tung <chien.tin.tung@intel.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/nes/nes_utils.c

@@ -540,11 +540,14 @@ struct nes_cqp_request *nes_get_cqp_request(struct nes_device *nesdev)
 
 	if (!list_empty(&nesdev->cqp_avail_reqs)) {
 		spin_lock_irqsave(&nesdev->cqp.lock, flags);
-		cqp_request = list_entry(nesdev->cqp_avail_reqs.next,
+		if (!list_empty(&nesdev->cqp_avail_reqs)) {
+			cqp_request = list_entry(nesdev->cqp_avail_reqs.next,
 				struct nes_cqp_request, list);
-		list_del_init(&cqp_request->list);
+			list_del_init(&cqp_request->list);
+		}
 		spin_unlock_irqrestore(&nesdev->cqp.lock, flags);
-	} else {
+	}
+	if (cqp_request == NULL) {
 		cqp_request = kzalloc(sizeof(struct nes_cqp_request), GFP_KERNEL);
 		if (cqp_request) {
 			cqp_request->dynamic = 1;