From: Nikolai Kondrashov Date: Sun, 22 Aug 2010 17:26:22 +0000 (+0400) Subject: HID: rdesc parser: remove local item size limit X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=67168fd7d4044f21c542128529216cfaad23c03e;p=deliverable%2Flinux.git HID: rdesc parser: remove local item size limit The HID report descriptor parser requires local items, except "delimiters", to have data. I.e. to have non-zero size. This removes the restriction. The HID specification doesn't seem to have such restriction and, for example, a "usage" item could have zero size if the usage ID is zero. At least one usage page - Keyboard/Keypad lists zero ID as valid. This doesn't seem to happen in the wild, probably because the official tool for authoring report descriptors always puts data even for zero values for some items, including "usage" items. However, this makes little sense and at least one open source tool for descriptor authoring generates zero data size "usage" items, which saves some space, especially if many such items are used in a descriptor. Signed-off-by: Nikolai Kondrashov Signed-off-by: Jiri Kosina --- diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index d0240d5e7793..fbabe52cbcdc 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -388,12 +388,6 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) __u32 data; unsigned n; - /* Local delimiter could have value 0, which allows size to be 0 */ - if (item->size == 0 && item->tag != HID_LOCAL_ITEM_TAG_DELIMITER) { - dbg_hid("item data expected for local item\n"); - return -1; - } - data = item_udata(item); switch (item->tag) {