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Commit 915ac4e2 authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 

Pull input updates from Dmitry Torokhov:
 "Some more updates for the input subsystem.

  You will get a fix for race in mousedev that has been causing quite a
  few oopses lately and a small fixup for force feedback support in
  evdev"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: mousedev - fix race when creating mixed device
  Input: don't modify the id of ioctl-provided ff effect on upload failure
parents aa4af831 e4dbedc7

drivers/input/evdev.c

+3 −1
Original line number Diff line number Diff line
@@ -954,11 +954,13 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, 
			return -EFAULT;



		error = input_ff_upload(dev, &effect, file);

		if (error)

			return error;



		if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))

			return -EFAULT;



		return error;

		return 0;

	}



	/* Multi-number variable-length handlers */

drivers/input/mousedev.c

+42 −31
Original line number Diff line number Diff line
@@ -67,7 +67,6 @@ struct mousedev { 
	struct device dev;

	struct cdev cdev;

	bool exist;

	bool is_mixdev;



	struct list_head mixdev_node;

	bool opened_by_mixdev;
@@ -77,6 +76,9 @@ struct mousedev { 
	int old_x[4], old_y[4];

	int frac_dx, frac_dy;

	unsigned long touch;



	int (*open_device)(struct mousedev *mousedev);

	void (*close_device)(struct mousedev *mousedev);

};



enum mousedev_emul {
@@ -116,9 +118,6 @@ static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 
static struct mousedev *mousedev_mix;

static LIST_HEAD(mousedev_mix_list);



static void mixdev_open_devices(void);

static void mixdev_close_devices(void);



#define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])

#define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
@@ -428,9 +427,7 @@ static int mousedev_open_device(struct mousedev *mousedev) 
	if (retval)

		return retval;



	if (mousedev->is_mixdev)

		mixdev_open_devices();

	else if (!mousedev->exist)

	if (!mousedev->exist)

		retval = -ENODEV;

	else if (!mousedev->open++) {

		retval = input_open_device(&mousedev->handle);
@@ -446,9 +443,7 @@ static void mousedev_close_device(struct mousedev *mousedev) 
{

	mutex_lock(&mousedev->mutex);



	if (mousedev->is_mixdev)

		mixdev_close_devices();

	else if (mousedev->exist && !--mousedev->open)

	if (mousedev->exist && !--mousedev->open)

		input_close_device(&mousedev->handle);



	mutex_unlock(&mousedev->mutex);
@@ -459,12 +454,16 @@ static void mousedev_close_device(struct mousedev *mousedev) 
 * stream. Note that this function is called with mousedev_mix->mutex

 * held.

 */

static void mixdev_open_devices(void)

static int mixdev_open_devices(struct mousedev *mixdev)

{

	struct mousedev *mousedev;

	int error;



	if (mousedev_mix->open++)

		return;

	error = mutex_lock_interruptible(&mixdev->mutex);

	if (error)

		return error;



	if (!mixdev->open++) {

		struct mousedev *mousedev;



		list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {

			if (!mousedev->opened_by_mixdev) {
@@ -476,17 +475,21 @@ static void mixdev_open_devices(void) 
		}

	}



	mutex_unlock(&mixdev->mutex);

	return 0;

}



/*

 * Close all devices that were opened as part of multiplexed

 * device. Note that this function is called with mousedev_mix->mutex

 * held.

 */

static void mixdev_close_devices(void)

static void mixdev_close_devices(struct mousedev *mixdev)

{

	struct mousedev *mousedev;

	mutex_lock(&mixdev->mutex);



	if (--mousedev_mix->open)

		return;

	if (!--mixdev->open) {

		struct mousedev *mousedev;



		list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {

			if (mousedev->opened_by_mixdev) {
@@ -496,6 +499,9 @@ static void mixdev_close_devices(void) 
		}

	}



	mutex_unlock(&mixdev->mutex);

}





static void mousedev_attach_client(struct mousedev *mousedev,

				   struct mousedev_client *client)
@@ -522,7 +528,7 @@ static int mousedev_release(struct inode *inode, struct file *file) 
	mousedev_detach_client(mousedev, client);

	kfree(client);



	mousedev_close_device(mousedev);

	mousedev->close_device(mousedev);



	return 0;

}
@@ -550,7 +556,7 @@ static int mousedev_open(struct inode *inode, struct file *file) 
	client->mousedev = mousedev;

	mousedev_attach_client(mousedev, client);



	error = mousedev_open_device(mousedev);

	error = mousedev->open_device(mousedev);

	if (error)

		goto err_free_client;
@@ -861,16 +867,21 @@ static struct mousedev *mousedev_create(struct input_dev *dev, 


	if (mixdev) {

		dev_set_name(&mousedev->dev, "mice");



		mousedev->open_device = mixdev_open_devices;

		mousedev->close_device = mixdev_close_devices;

	} else {

		int dev_no = minor;

		/* Normalize device number if it falls into legacy range */

		if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)

			dev_no -= MOUSEDEV_MINOR_BASE;

		dev_set_name(&mousedev->dev, "mouse%d", dev_no);



		mousedev->open_device = mousedev_open_device;

		mousedev->close_device = mousedev_close_device;

	}



	mousedev->exist = true;

	mousedev->is_mixdev = mixdev;

	mousedev->handle.dev = input_get_device(dev);

	mousedev->handle.name = dev_name(&mousedev->dev);

	mousedev->handle.handler = handler;
@@ -919,7 +930,7 @@ static void mousedev_destroy(struct mousedev *mousedev) 
	device_del(&mousedev->dev);

	mousedev_cleanup(mousedev);

	input_free_minor(MINOR(mousedev->dev.devt));

	if (!mousedev->is_mixdev)

	if (mousedev != mousedev_mix)

		input_unregister_handle(&mousedev->handle);

	put_device(&mousedev->dev);

}