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Commit f4f37c8e authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: Add proper locking when changing device's keymap 



Take dev->event_lock to make sure that we don't race with input_event() and
also force key up event when removing a key from keymap table.

Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 554101e3

drivers/char/keyboard.c

+2 −2
Original line number Diff line number Diff line
@@ -194,7 +194,7 @@ int getkeycode(unsigned int scancode) 
	int error = -ENODEV;



	list_for_each_entry(handle, &kbd_handler.h_list, h_node) {

		error = handle->dev->getkeycode(handle->dev, scancode, &keycode);

		error = input_get_keycode(handle->dev, scancode, &keycode);

		if (!error)

			return keycode;

	}
@@ -208,7 +208,7 @@ int setkeycode(unsigned int scancode, unsigned int keycode) 
	int error = -ENODEV;



	list_for_each_entry(handle, &kbd_handler.h_list, h_node) {

		error = handle->dev->setkeycode(handle->dev, scancode, keycode);

		error = input_set_keycode(handle->dev, scancode, keycode);

		if (!error)

			break;

	}

drivers/input/evdev.c

+3 −3
Original line number Diff line number Diff line
@@ -617,7 +617,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, 
		if (get_user(t, ip))

			return -EFAULT;



		error = dev->getkeycode(dev, t, &v);

		error = input_get_keycode(dev, t, &v);

		if (error)

			return error;
@@ -630,7 +630,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, 
		if (get_user(t, ip) || get_user(v, ip + 1))

			return -EFAULT;



		return dev->setkeycode(dev, t, v);

		return input_set_keycode(dev, t, v);



	case EVIOCSFF:

		if (copy_from_user(&effect, p, sizeof(effect)))

drivers/input/input.c

+72 −6
Original line number Diff line number Diff line
@@ -493,7 +493,7 @@ static void input_disconnect_device(struct input_dev *dev) 
	if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {

		for (code = 0; code <= KEY_MAX; code++) {

			if (is_event_supported(code, dev->keybit, KEY_MAX) &&

			    test_bit(code, dev->key)) {

			    __test_and_clear_bit(code, dev->key)) {

				input_pass_event(dev, EV_KEY, code, 0);

			}

		}
@@ -526,7 +526,7 @@ static int input_default_getkeycode(struct input_dev *dev, 
	if (!dev->keycodesize)

		return -EINVAL;



	if (scancode < 0 || scancode >= dev->keycodemax)

	if (scancode >= dev->keycodemax)

		return -EINVAL;



	*keycode = input_fetch_keycode(dev, scancode);
@@ -540,10 +540,7 @@ static int input_default_setkeycode(struct input_dev *dev, 
	int old_keycode;

	int i;



	if (scancode < 0 || scancode >= dev->keycodemax)

		return -EINVAL;



	if (keycode < 0 || keycode > KEY_MAX)

	if (scancode >= dev->keycodemax)

		return -EINVAL;



	if (!dev->keycodesize)
@@ -586,6 +583,75 @@ static int input_default_setkeycode(struct input_dev *dev, 
	return 0;

}



/**

 * input_get_keycode - retrieve keycode currently mapped to a given scancode

 * @dev: input device which keymap is being queried

 * @scancode: scancode (or its equivalent for device in question) for which

 *	keycode is needed

 * @keycode: result

 *

 * This function should be called by anyone interested in retrieving current

 * keymap. Presently keyboard and evdev handlers use it.

 */

int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)

{

	if (scancode < 0)

		return -EINVAL;



	return dev->getkeycode(dev, scancode, keycode);

}

EXPORT_SYMBOL(input_get_keycode);



/**

 * input_get_keycode - assign new keycode to a given scancode

 * @dev: input device which keymap is being updated

 * @scancode: scancode (or its equivalent for device in question)

 * @keycode: new keycode to be assigned to the scancode

 *

 * This function should be called by anyone needing to update current

 * keymap. Presently keyboard and evdev handlers use it.

 */

int input_set_keycode(struct input_dev *dev, int scancode, int keycode)

{

	unsigned long flags;

	int old_keycode;

	int retval;



	if (scancode < 0)

		return -EINVAL;



	if (keycode < 0 || keycode > KEY_MAX)

		return -EINVAL;



	spin_lock_irqsave(&dev->event_lock, flags);



	retval = dev->getkeycode(dev, scancode, &old_keycode);

	if (retval)

		goto out;



	retval = dev->setkeycode(dev, scancode, keycode);

	if (retval)

		goto out;



	/*

	 * Simulate keyup event if keycode is not present

	 * in the keymap anymore

	 */

	if (test_bit(EV_KEY, dev->evbit) &&

	    !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&

	    __test_and_clear_bit(old_keycode, dev->key)) {



		input_pass_event(dev, EV_KEY, old_keycode, 0);

		if (dev->sync)

			input_pass_event(dev, EV_SYN, SYN_REPORT, 1);

	}



 out:

	spin_unlock_irqrestore(&dev->event_lock, flags);



	return retval;

}

EXPORT_SYMBOL(input_set_keycode);



#define MATCH_BIT(bit, max) \

		for (i = 0; i < BITS_TO_LONGS(max); i++) \

include/linux/input.h

+3 −0
Original line number Diff line number Diff line
@@ -1309,6 +1309,9 @@ static inline void input_set_abs_params(struct input_dev *dev, int axis, int min 
	dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);

}



int input_get_keycode(struct input_dev *dev, int scancode, int *keycode);

int input_set_keycode(struct input_dev *dev, int scancode, int keycode);



extern struct class input_class;



/**