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Input: fix used slots detection breakage 

Commit f8ec894945 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: f8ec894945 ("Input: MT - make slot cleanup callable outside
mt_sync_frame()")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=83081

Reported-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2014-08-25 11:31:02 -07:00
parent fb92be7ba8
commit 8ff21f44fa
1 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/input/input-mt.c
View File

@ -236,6 +236,18 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
}
EXPORT_SYMBOL(input_mt_report_pointer_emulation);
static void __input_mt_drop_unused(struct input_dev *dev, struct input_mt *mt)
{
int i;
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
@ -245,19 +257,11 @@ EXPORT_SYMBOL(input_mt_report_pointer_emulation);
void input_mt_drop_unused(struct input_dev *dev)
{
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);
}
if (mt) {
__input_mt_drop_unused(dev, mt);
mt->frame++;
}
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);