github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-04 04:23:35 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

Input: zforce_ts - use guard notation when acquiring mutexes

Browse Source 
Guard notation allows for simpler code and ensures that mutexes are
automatically released in all code paths.

Tested-by: Andreas Kemnade <andreas@kemnade.info> # Tolino Shine2HD
Link: https://lore.kernel.org/r/20240824055047.1706392-9-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2024-08-23 22:50:32 -07:00
parent 9ba33f6145
commit 5c2002677e
1 changed files with 24 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/input/touchscreen/zforce_ts.c
View File

@ -578,17 +578,13 @@ static void zforce_input_close(struct input_dev *dev)
return;
}
static int zforce_suspend(struct device *dev)
static int __zforce_suspend(struct zforce_ts *ts)
{
struct i2c_client *client = to_i2c_client(dev);
struct zforce_ts *ts = i2c_get_clientdata(client);
struct i2c_client *client = ts->client;
struct input_dev *input = ts->input;
int ret = 0;
int ret;
mutex_lock(&input->mutex);
WRITE_ONCE(ts->suspending, true);
smp_mb();
guard(mutex)(&input->mutex);
/*
* When configured as a wakeup source device should always wake
@ -601,7 +597,7 @@ static int zforce_suspend(struct device *dev)
if (!input_device_enabled(input)) {
ret = zforce_start(ts);
if (ret)
goto unlock;
return ret;
}
enable_irq_wake(client->irq);
@ -611,19 +607,29 @@ static int zforce_suspend(struct device *dev)
ret = zforce_stop(ts);
if (ret)
goto unlock;
return ret;
disable_irq(client->irq);
}
ts->suspended = true;
return 0;
}
static int zforce_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct zforce_ts *ts = i2c_get_clientdata(client);
int ret;
WRITE_ONCE(ts->suspending, true);
smp_mb();
ret = __zforce_suspend(ts);
unlock:
smp_mb();
WRITE_ONCE(ts->suspending, false);
mutex_unlock(&input->mutex);
return ret;
}
@ -632,9 +638,9 @@ static int zforce_resume(struct device *dev)
struct i2c_client *client = to_i2c_client(dev);
struct zforce_ts *ts = i2c_get_clientdata(client);
struct input_dev *input = ts->input;
int ret = 0;
int ret;
mutex_lock(&input->mutex);
guard(mutex)(&input->mutex);
ts->suspended = false;
@ -647,7 +653,7 @@ static int zforce_resume(struct device *dev)
if (!input_device_enabled(input)) {
ret = zforce_stop(ts);
if (ret)
goto unlock;
return ret;
}
} else if (input_device_enabled(input)) {
dev_dbg(&client->dev, "resume without being a wakeup source\n");
@ -656,13 +662,10 @@ static int zforce_resume(struct device *dev)
ret = zforce_start(ts);
if (ret < 0)
goto unlock;
return ret;
}
unlock:
mutex_unlock(&input->mutex);
return ret;
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);