openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

can: c_can: c_can_power_up(): fix error handling 

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: 8212003260 ("can: c_can: Add d_can suspend resume support")
Fixes: 52cde85acc ("can: c_can: Add d_can raminit support")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201128133922.3276973-2-zhangqilong3@huawei.com
[mkl: return "0" instead of "ret"]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Zhang Qilong 2020-11-28 21:39:21 +08:00 committed by Marc Kleine-Budde
parent c2d095eff7
commit 44cef0c0ff
1 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/net/can/c_can/c_can.c
View File

@ -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 0;
err_out:
c_can_reset_ram(priv, false);
c_can_pm_runtime_put_sync(priv);
return ret;
}