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Commit 8ff21f44 authored by Dmitry Torokhov's avatar Dmitry Torokhov
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Input: fix used slots detection breakage 

Commit f8ec8949 allowed external callers
use slot dropping logic, unfortunately it also broke external users of
input_mt_is_used() as we stopped incrementing frame count unless input
device was set up to automatically drop unused slots.

Fixes: f8ec8949 ("Input: MT - make slot cleanup callable outside
mt_sync_frame()")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=83081



Reported-by: default avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
Tested-by: default avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
Reviewed-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent fb92be7b

drivers/input/input-mt.c

+18 −12
Original line number Diff line number Diff line
@@ -236,29 +236,33 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count) 
}

EXPORT_SYMBOL(input_mt_report_pointer_emulation);



/**

 * input_mt_drop_unused() - Inactivate slots not seen in this frame

 * @dev: input device with allocated MT slots

 *

 * Lift all slots not seen since the last call to this function.

 */

void input_mt_drop_unused(struct input_dev *dev)

static void __input_mt_drop_unused(struct input_dev *dev, struct input_mt *mt)

{

	struct input_mt *mt = dev->mt;

	int i;



	if (!mt)

		return;



	for (i = 0; i < mt->num_slots; i++) {

		if (!input_mt_is_used(mt, &mt->slots[i])) {

			input_mt_slot(dev, i);

			input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);

		}

	}

}



/**

 * input_mt_drop_unused() - Inactivate slots not seen in this frame

 * @dev: input device with allocated MT slots

 *

 * Lift all slots not seen since the last call to this function.

 */

void input_mt_drop_unused(struct input_dev *dev)

{

	struct input_mt *mt = dev->mt;



	if (mt) {

		__input_mt_drop_unused(dev, mt);

		mt->frame++;

	}

}

EXPORT_SYMBOL(input_mt_drop_unused);



/**
@@ -278,12 +282,14 @@ void input_mt_sync_frame(struct input_dev *dev) 
		return;



	if (mt->flags & INPUT_MT_DROP_UNUSED)

		input_mt_drop_unused(dev);

		__input_mt_drop_unused(dev, mt);



	if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))

		use_count = true;



	input_mt_report_pointer_emulation(dev, use_count);



	mt->frame++;

}

EXPORT_SYMBOL(input_mt_sync_frame);