[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240824055047.1706392-9-dmitry.torokhov@gmail.com>
Date: Fri, 23 Aug 2024 22:50:32 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Heiko Stübner <heiko@...ech.de>,
linux-input@...r.kernel.org
Cc: Andreas Kemnade <andreas@...nade.info>,
linux-kernel@...r.kernel.org
Subject: [PATCH 08/18] Input: zforce_ts - use guard notation when acquiring mutexes
Guard notation allows for simpler code and ensures that mutexes are
automatically released in all code paths.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
drivers/input/touchscreen/zforce_ts.c | 45 ++++++++++++++-------------
1 file changed, 24 insertions(+), 21 deletions(-)
diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
index 004ef728fb90..0dea389594bd 100644
--- a/drivers/input/touchscreen/zforce_ts.c
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -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;
-
- mutex_lock(&input->mutex);
+ int ret;
- 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);
@@ -611,18 +607,28 @@ 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;
+}
-unlock:
+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();
- WRITE_ONCE(ts->suspending, false);
- mutex_unlock(&input->mutex);
+ ret = __zforce_suspend(ts);
+
+ smp_mb();
+ WRITE_ONCE(ts->suspending, false);
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);
--
2.46.0.295.g3b9ea8a38a-goog
Powered by blists - more mailing lists