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Input: input-polldev - use system-wide freezable workqueue 

With introduction of concurrency-managed work queues there is rarely
a point in creating private workqueues.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2011-04-27 23:20:16 -07:00
parent 34abeeb235
commit e490ebdc3c
1 changed files with 3 additions and 53 deletions
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56
drivers/input/input-polldev.c
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@ -13,6 +13,7 @@
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/input-polldev.h>
MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
@ -20,44 +21,6 @@ MODULE_DESCRIPTION("Generic implementation of a polled input device");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1");
static DEFINE_MUTEX(polldev_mutex);
static int polldev_users;
static struct workqueue_struct *polldev_wq;
static int input_polldev_start_workqueue(void)
{
int retval;
retval = mutex_lock_interruptible(&polldev_mutex);
if (retval)
return retval;
if (!polldev_users) {
polldev_wq = create_singlethread_workqueue("ipolldevd");
if (!polldev_wq) {
pr_err("failed to create ipolldevd workqueue\n");
retval = -ENOMEM;
goto out;
}
}
polldev_users++;
out:
mutex_unlock(&polldev_mutex);
return retval;
}
static void input_polldev_stop_workqueue(void)
{
mutex_lock(&polldev_mutex);
if (!--polldev_users)
destroy_workqueue(polldev_wq);
mutex_unlock(&polldev_mutex);
}
static void input_polldev_queue_work(struct input_polled_dev *dev)
{
unsigned long delay;
@ -66,7 +29,7 @@ static void input_polldev_queue_work(struct input_polled_dev *dev)
if (delay >= HZ)
delay = round_jiffies_relative(delay);
queue_delayed_work(polldev_wq, &dev->work, delay);
queue_delayed_work(system_freezable_wq, &dev->work, delay);
}
static void input_polled_device_work(struct work_struct *work)
@ -81,18 +44,13 @@ static void input_polled_device_work(struct work_struct *work)
static int input_open_polled_device(struct input_dev *input)
{
struct input_polled_dev *dev = input_get_drvdata(input);
int error;
error = input_polldev_start_workqueue();
if (error)
return error;
if (dev->open)
dev->open(dev);
/* Only start polling if polling is enabled */
if (dev->poll_interval > 0)
queue_delayed_work(polldev_wq, &dev->work, 0);
queue_delayed_work(system_freezable_wq, &dev->work, 0);
return 0;
}
@ -102,13 +60,6 @@ static void input_close_polled_device(struct input_dev *input)
struct input_polled_dev *dev = input_get_drvdata(input);
cancel_delayed_work_sync(&dev->work);
/*
* Clean up work struct to remove references to the workqueue.
* It may be destroyed by the next call. This causes problems
* at next device open-close in case of poll_interval == 0.
*/
INIT_DELAYED_WORK(&dev->work, dev->work.work.func);
input_polldev_stop_workqueue();
if (dev->close)
dev->close(dev);
@ -295,4 +246,3 @@ void input_unregister_polled_device(struct input_polled_dev *dev)
input_unregister_device(dev->input);
}
EXPORT_SYMBOL(input_unregister_polled_device);