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Subject[PATCH V2 for-next 3/8] RDMA/hns: Add return statement when kzalloc return NULL in hns_roce_v1_recreate_lp_qp
Date
When lp_qp_work is NULL, it should be returned ENOMEM. This patch
mainly adds the error checking branch, modifies the return value of
the function named hns_roce_v1_set_mac that calling
hns_roce_v1_recreate_lp_qp.

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: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
---
Patch V2: Address comments by Leon:
https://lkml.org/lkml/2017/9/28/382

Patch V1: Initial Submit
---
drivers/infiniband/hw/hns/hns_roce_device.h | 2 +-
drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 16 +++++++++++++---
drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 6 ++++--
drivers/infiniband/hw/hns/hns_roce_main.c | 17 +++++++++++------
4 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index 4f43c91..4d9d5d7 100644
--- 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 95f5c88..6f309f7 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;

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 4171f73..e5fe2cd 100644
--- 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
--- 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;
--
1.9.1
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