linux-kernel - [PATCH V2 for-next 6/8] RDMA/hns: Add return statement when checking error in hns_roce_v1_mr_free_work

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Message-ID: <1506697814-98432-7-git-send-email-xavier.huwei@huawei.com>
Date:   Fri, 29 Sep 2017 23:10:12 +0800
From:   "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
To:     <dledford@...hat.com>
CC:     <linux-rdma@...r.kernel.org>, <xavier.huwei@...wei.com>,
        <lijun_nudt@....com>, <oulijun@...wei.com>,
        <charles.chenxin@...wei.com>, <liuyixian@...wei.com>,
        <xushaobo2@...wei.com>, <zhangxiping3@...wei.com>,
        <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <shaobohsu@....com>
Subject: [PATCH V2 for-next 6/8] RDMA/hns: Add return statement when checking error in hns_roce_v1_mr_free_work_fn

After the loop in hns_roce_v1_mr_free_work_fn function, it is possible that
the local variable named hr_qp is NULL, the operation "hr_qp->qpn" will
result in the exception. As a result, we add return statement when checking
error.

This patch fixes the smatch error as below:
drivers/infiniband/hw/hns/hns_roce_hw_v1.c:1009 hns_roce_v1_mr_free_work_fn()
error: we previously assumed 'hr_qp' could be null

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@...wei.com>
Signed-off-by: Lijun Ou <oulijun@...wei.com>
Signed-off-by: Shaobo Xu <xushaobo2@...wei.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index d82b4de..15e0f2e 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -1004,6 +1004,11 @@ static void hns_roce_v1_mr_free_work_fn(struct work_struct *work)
 		}
 	}
 
+	if (!ne) {
+		dev_err(dev, "Reseved loop qp is absent!\n");
+		goto free_work;
+	}
+
 	do {
 		ret = hns_roce_v1_poll_cq(&mr_free_cq->ib_cq, ne, wc);
 		if (ret < 0) {
-- 
1.9.1