| Message ID | 20201128133922.3276973-2-zhangqilong3@huawei.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | can: Fix the error handling in c_can_power_up and kvaser_pciefd_open | expand |
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 0420f09f2b70..becfdff7f3fd 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -1295,12 +1295,22 @@ int c_can_power_up(struct net_device *dev) time_after(time_out, jiffies)) cpu_relax(); - if (time_after(jiffies, time_out)) - return -ETIMEDOUT; + if (time_after(jiffies, time_out)) { + ret = -ETIMEDOUT; + goto err_out; + } ret = c_can_start(dev); - if (!ret) - c_can_irq_control(priv, true); + if (ret) + goto err_out; + + c_can_irq_control(priv, true); + + return ret; + +err_out: + c_can_reset_ram(priv, false); + c_can_pm_runtime_put_sync(priv); return ret; }
In the error handling in c_can_power_up, There are two bugs: 1) c_can_pm_runtime_get_sync will increase usage counter if device is not empty. Forgetting to call c_can_pm_runtime_put_sync will result in a reference leak here. 2) c_can_reset_ram operation will set start bit when enable is true. We should clear it in the error handling. We fix it by adding c_can_pm_runtime_put_sync for 1), and c_can_reset_ram(enable is false) for 2) in the error handling. Fixes: 8212003260c60 ("can: c_can: Add d_can suspend resume support") Fixes: 52cde85acc23f ("can: c_can: Add d_can raminit support") Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com> --- drivers/net/can/c_can/c_can.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)