IB/hns: Fix the bug when free mr

Hello Shaobo Xu,

The patch bfcc681bd09d: "IB/hns: Fix the bug when free mr" from Nov 29, 2016, leads to the following static checker warning:

	drivers/infiniband/hw/hns/hns_roce_hw_v1.c:909 hns_roce_v1_recreate_lp_qp()
	error: potential null dereference 'lp_qp_work'.  (kzalloc returns null)

drivers/infiniband/hw/hns/hns_roce_hw_v1.c
891 static int hns_roce_v1_recreate_lp_qp(struct hns_roce_dev *hr_dev) 892 {

   893          struct device *dev = &hr_dev->pdev->dev;
   894          struct hns_roce_recreate_lp_qp_work *lp_qp_work;
   895          struct hns_roce_free_mr *free_mr;
   896          struct hns_roce_v1_priv *priv;
   897          struct completion comp;
   898          unsigned long end =
   899            msecs_to_jiffies(HNS_ROCE_V1_RECREATE_LP_QP_TIMEOUT_MSECS) + jiffies;
   900  
   901          priv = (struct hns_roce_v1_priv *)hr_dev->hw->priv;
   902          free_mr = &priv->free_mr;
   903  
   904          lp_qp_work = kzalloc(sizeof(struct hns_roce_recreate_lp_qp_work),
                ^^^^^^^^^^^^^^^^^^^^

Not checked.

   905                               GFP_KERNEL);
   906  
   907          INIT_WORK(&(lp_qp_work->work), hns_roce_v1_recreate_lp_qp_work_fn);
   908  
   909          lp_qp_work->ib_dev = &(hr_dev->ib_dev);
   910          lp_qp_work->comp = ∁
   911          lp_qp_work->comp_flag = 1;
   912  
   913          init_completion(lp_qp_work->comp);
   914  
   915          queue_work(free_mr->free_mr_wq, &(lp_qp_work->work));
   916  
   917          while (time_before_eq(jiffies, end)) {
   918                  if (try_wait_for_completion(&comp))
   919                          return 0;
   920                  msleep(HNS_ROCE_V1_RECREATE_LP_QP_WAIT_VALUE);
   921          }

regards,
dan carpenter
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hi, Dan:

Thanks for your suggestion.
I will fix the warning later.

Best Regards,
Xu, Shaobo

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