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| author | Zhang Qilong <zhangqilong3@huawei.com> | 2020-11-28 21:39:21 +0800 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2020-11-30 12:43:55 +0100 |
| commit | 44cef0c0ffbd8d61143712ce874be68a273b7884 (patch) | |
| tree | 401ac60b5f06beac0212f43b9a2abdc1e1e4bb7f | |
| parent | c2d095eff797813461a426b97242e3ffc50e4134 (diff) | |
| download | linux-44cef0c0ffbd8d61143712ce874be68a273b7884.tar.bz2 | |
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: 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>
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>
| -rw-r--r-- | drivers/net/can/c_can/c_can.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 1ccdbe89585b..1a9e9b9a4bf6 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 0; + +err_out: + c_can_reset_ram(priv, false); + c_can_pm_runtime_put_sync(priv); return ret; } |