RDMA/hns: Check return value of kzalloc

When lp_qp_work is NULL, we should return ENOMEM.  In order to do so,
we had to make some upper layer functions return a value instead
of being void type so we can propagate the error up the stack.

This 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: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index 4f43c91..4d9d5d7 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -581,7 +581,7 @@ struct hns_roce_hw {
        int (*chk_mbox)(struct hns_roce_dev *hr_dev, unsigned long timeout);
        void (*set_gid)(struct hns_roce_dev *hr_dev, u8 port, int gid_index,
                        union ib_gid *gid);
-       void (*set_mac)(struct hns_roce_dev *hr_dev, u8 phy_port, u8 *addr);
+       int (*set_mac)(struct hns_roce_dev *hr_dev, u8 phy_port, u8 *addr);
        void (*set_mtu)(struct hns_roce_dev *hr_dev, u8 phy_port,
                        enum ib_mtu mtu);
        int (*write_mtpt)(void *mb_buf, struct hns_roce_mr *mr,

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 5d232e3..93010a5 100644 (file)
--- 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;
 
        INIT_WORK(&(lp_qp_work->work), hns_roce_v1_recreate_lp_qp_work_fn);
 
@@ -1719,7 +1721,8 @@ void hns_roce_v1_set_gid(struct hns_roce_dev *hr_dev, u8 port, int gid_index,
                       (HNS_ROCE_V1_GID_NUM * gid_idx));
 }
 
-void hns_roce_v1_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port, u8 *addr)
+static int hns_roce_v1_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port,
+                              u8 *addr)
 {
        u32 reg_smac_l;
        u16 reg_smac_h;
@@ -1732,8 +1735,13 @@ void hns_roce_v1_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port, u8 *addr)
         * because of smac not equal to dmac.
         * We Need to release and create reserved qp again.
         */
-       if (hr_dev->hw->dereg_mr && hns_roce_v1_recreate_lp_qp(hr_dev))
-               dev_warn(&hr_dev->pdev->dev, "recreate lp qp timeout!\n");
+       if (hr_dev->hw->dereg_mr) {
+               int ret;
+
+               ret = hns_roce_v1_recreate_lp_qp(hr_dev);
+               if (ret && ret != -ETIMEDOUT)
+                       return ret;
+       }
 
        p = (u32 *)(&addr[0]);
        reg_smac_l = *p;
@@ -1748,6 +1756,8 @@ void hns_roce_v1_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port, u8 *addr)
                       ROCEE_SMAC_H_ROCEE_SMAC_H_S, reg_smac_h);
        roce_write(hr_dev, ROCEE_SMAC_H_0_REG + phy_port * PHY_PORT_OFFSET,
                   val);
+
+       return 0;
 }
 
 void hns_roce_v1_set_mtu(struct hns_roce_dev *hr_dev, u8 phy_port,

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 0eab9ce..fa60eb3 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -1068,8 +1068,8 @@ static void hns_roce_v2_set_gid(struct hns_roce_dev *hr_dev, u8 port,
        roce_write(hr_dev, ROCEE_VF_SGID_CFG4_REG + 0x20 * gid_index, val);
 }
 
-static void hns_roce_v2_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port,
-                               u8 *addr)
+static int hns_roce_v2_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port,
+                              u8 *addr)
 {
        u16 reg_smac_h;
        u32 reg_smac_l;
@@ -1084,6 +1084,8 @@ static void hns_roce_v2_set_mac(struct hns_roce_dev *hr_dev, u8 phy_port,
        roce_set_field(val, ROCEE_VF_SMAC_CFG1_VF_SMAC_H_M,
                       ROCEE_VF_SMAC_CFG1_VF_SMAC_H_S, reg_smac_h);
        roce_write(hr_dev, ROCEE_VF_SMAC_CFG1_REG + 0x08 * phy_port, val);
+
+       return 0;
 }
 
 static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,

diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 7a0c1e8..6f2d572 100644 (file)
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -59,19 +59,19 @@ int hns_get_gid_index(struct hns_roce_dev *hr_dev, u8 port, int gid_index)
 }
 EXPORT_SYMBOL_GPL(hns_get_gid_index);
 
-static void hns_roce_set_mac(struct hns_roce_dev *hr_dev, u8 port, u8 *addr)
+static int hns_roce_set_mac(struct hns_roce_dev *hr_dev, u8 port, u8 *addr)
 {
        u8 phy_port;
        u32 i = 0;
 
        if (!memcmp(hr_dev->dev_addr[port], addr, MAC_ADDR_OCTET_NUM))
-               return;
+               return 0;
 
        for (i = 0; i < MAC_ADDR_OCTET_NUM; i++)
                hr_dev->dev_addr[port][i] = addr[i];
 
        phy_port = hr_dev->iboe.phy_port[port];
-       hr_dev->hw->set_mac(hr_dev, phy_port, addr);
+       return hr_dev->hw->set_mac(hr_dev, phy_port, addr);
 }
 
 static int hns_roce_add_gid(struct ib_device *device, u8 port_num,
@@ -119,6 +119,7 @@ static int handle_en_event(struct hns_roce_dev *hr_dev, u8 port,
 {
        struct device *dev = hr_dev->dev;
        struct net_device *netdev;
+       int ret = 0;
 
        netdev = hr_dev->iboe.netdevs[port];
        if (!netdev) {
@@ -131,7 +132,7 @@ static int handle_en_event(struct hns_roce_dev *hr_dev, u8 port,
        case NETDEV_CHANGE:
        case NETDEV_REGISTER:
        case NETDEV_CHANGEADDR:
-               hns_roce_set_mac(hr_dev, port, netdev->dev_addr);
+               ret = hns_roce_set_mac(hr_dev, port, netdev->dev_addr);
                break;
        case NETDEV_DOWN:
                /*
@@ -143,7 +144,7 @@ static int handle_en_event(struct hns_roce_dev *hr_dev, u8 port,
                break;
        }
 
-       return 0;
+       return ret;
 }
 
 static int hns_roce_netdev_event(struct notifier_block *self,
@@ -172,13 +173,17 @@ static int hns_roce_netdev_event(struct notifier_block *self,
 
 static int hns_roce_setup_mtu_mac(struct hns_roce_dev *hr_dev)
 {
+       int ret;
        u8 i;
 
        for (i = 0; i < hr_dev->caps.num_ports; i++) {
                if (hr_dev->hw->set_mtu)
                        hr_dev->hw->set_mtu(hr_dev, hr_dev->iboe.phy_port[i],
                                            hr_dev->caps.max_mtu);
-               hns_roce_set_mac(hr_dev, i, hr_dev->iboe.netdevs[i]->dev_addr);
+               ret = hns_roce_set_mac(hr_dev, i,
+                                      hr_dev->iboe.netdevs[i]->dev_addr);
+               if (ret)
+                       return ret;
        }
 
        return 0;