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Commit ba538cd2 authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: serio_raw - use kref instead of rolling out its own refcounting 



Reviewed-by: default avatarWanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent b5d21704

drivers/input/serio/serio_raw.c

+13 −15
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
 * the Free Software Foundation.

 */



#include <linux/kref.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/poll.h>
@@ -33,7 +34,7 @@ struct serio_raw { 
	unsigned int tail, head;



	char name[16];

	unsigned int refcnt;

	struct kref kref;

	struct serio *serio;

	struct miscdevice dev;

	wait_queue_head_t wait;
@@ -104,7 +105,7 @@ static int serio_raw_open(struct inode *inode, struct file *file) 
	list->serio_raw = serio_raw;

	file->private_data = list;



	serio_raw->refcnt++;

	kref_get(&serio_raw->kref);

	list_add_tail(&list->node, &serio_raw->list);



out:
@@ -112,17 +113,14 @@ out: 
	return retval;

}



static int serio_raw_cleanup(struct serio_raw *serio_raw)

static void serio_raw_cleanup(struct kref *kref)

{

	if (--serio_raw->refcnt == 0) {

	struct serio_raw *serio_raw =

			container_of(kref, struct serio_raw, kref);



	misc_deregister(&serio_raw->dev);

	list_del_init(&serio_raw->node);

	kfree(serio_raw);



		return 1;

	}



	return 0;

}



static int serio_raw_release(struct inode *inode, struct file *file)
@@ -132,7 +130,7 @@ static int serio_raw_release(struct inode *inode, struct file *file) 


	mutex_lock(&serio_raw_mutex);



	serio_raw_cleanup(serio_raw);

	kref_put(&serio_raw->kref, serio_raw_cleanup);



	mutex_unlock(&serio_raw_mutex);

	return 0;
@@ -283,7 +281,7 @@ static int serio_raw_connect(struct serio *serio, struct serio_driver *drv) 
	mutex_lock(&serio_raw_mutex);



	snprintf(serio_raw->name, sizeof(serio_raw->name), "serio_raw%d", serio_raw_no++);

	serio_raw->refcnt = 1;

	kref_init(&serio_raw->kref);

	serio_raw->serio = serio;

	INIT_LIST_HEAD(&serio_raw->list);

	init_waitqueue_head(&serio_raw->wait);
@@ -357,8 +355,8 @@ static void serio_raw_disconnect(struct serio *serio) 
	serio_set_drvdata(serio, NULL);



	serio_raw->serio = NULL;

	if (!serio_raw_cleanup(serio_raw))

	wake_up_interruptible(&serio_raw->wait);

	kref_put(&serio_raw->kref, serio_raw_cleanup);



	mutex_unlock(&serio_raw_mutex);

}