From 50bc03ab5c7529fdfe4e01621efca7d26439ea00 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Tue, 21 Jun 2011 15:01:53 +0200 Subject: [PATCH] HID: hid-multitouch: ensure slots are initialized In case a device does not provide the feature "Maximum Contact Count", or set it at 0, the maxcontacts field may be at 0 while calling input_mt_init_slots. This patch ensures that hid-multitouch will allways report ABS_MT_SLOT and ABS_MT_TRACKING_ID to the user space. This corrects a bug found with some Ilitek devices that has been integrated in 3.0-rc0. Signed-off-by: Benjamin Tissoires Signed-off-by: Jiri Kosina --- drivers/hid/hid-multitouch.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 0b2dcd0ee591..386765654cf6 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -271,6 +271,8 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, } return 1; case HID_DG_CONTACTID: + if (!td->maxcontacts) + td->maxcontacts = MT_DEFAULT_MAXCONTACT; input_mt_init_slots(hi->input, td->maxcontacts); td->last_slot_field = usage->hid; td->last_field_index = field->index; @@ -547,9 +549,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id) if (ret) goto fail; - if (!td->maxcontacts) - td->maxcontacts = MT_DEFAULT_MAXCONTACT; - td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot), GFP_KERNEL); if (!td->slots) { -- 2.30.2