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>

diff --git a/drivers/input/input-polldev.c b/drivers/input/input-polldev.c
index 3037842..b1aabde 100644 (file)
--- a/drivers/input/input-polldev.c
+++ b/drivers/input/input-polldev.c
@@ -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);
-