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SubjectRe: [PATCH for-next 3/9] RDMA/hns: Add return statement when kzalloc return NULL in hns_roce_v1_recreate_lp_qp
On Thu, Sep 28, 2017 at 12:57:28PM +0800, Wei Hu (Xavier) wrote:
> From: Lijun Ou <oulijun@huawei.com>
>
> When lp_qp_work is NULL, it should be returned ENOMEM. This patch
> mainly fixes it.
>
> Ihis patch fixes the smatch error as below:
> drivers/infiniband/hw/hns/hns_roce_hw_v1.c:918 hns_roce_v1_recreate_lp_qp()
> error: potential null dereference 'lp_qp_work'. (kzalloc returns null)
>
> Signed-off-by: Lijun Ou <oulijun@huawei.com>
> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
> Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
> ---
> drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 95f5c88..1071fa2 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -912,6 +912,8 @@ static int hns_roce_v1_recreate_lp_qp(struct hns_roce_dev *hr_dev)
>
> lp_qp_work = kzalloc(sizeof(struct hns_roce_recreate_lp_qp_work),
> GFP_KERNEL);
> + if (!lp_qp_work)
> + return -ENOMEM;
>

You will treat this error in the same was as you will treat timeout,
which is wrong.

1656 */
1657 if (hr_dev->hw->dereg_mr && hns_roce_v1_recreate_lp_qp(hr_dev))
1658 dev_warn(&hr_dev->pdev->dev, "recreate lp qp timeout!\n");
1659
1660 p = (u32 *)(&addr[0]);


> INIT_WORK(&(lp_qp_work->work), hns_roce_v1_recreate_lp_qp_work_fn);
>
> --
> 1.9.1
>
> --
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