Commit 8c3d52fc authored by Jiri Kosina's avatar Jiri Kosina
Browse files

HID: make parser more verbose about parsing errors by default 



Most of the parsing errors (typically resulting in device not being claimed
by HID subsystem at all) are reported only in debugging mode, which makes
root-causing problems with buggy devices unnecessarily more difficult.

Convert reporting of important HID report descriptor parsing errors to
be reported through hid_err() / hid_warn() instead of dbg_hid().

Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 67200795

drivers/hid/hid-core.c

+26 −24
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ static struct hid_field *hid_register_field(struct hid_report *report, unsigned 
	struct hid_field *field;



	if (report->maxfield == HID_MAX_FIELDS) {

		dbg_hid("too many fields in report\n");

		hid_err(report->device, "too many fields in report\n");

		return NULL;

	}
@@ -121,7 +121,7 @@ static int open_collection(struct hid_parser *parser, unsigned type) 
	usage = parser->local.usage[0];



	if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) {

		dbg_hid("collection stack overflow\n");

		hid_err(parser->device, "collection stack overflow\n");

		return -1;

	}
@@ -129,7 +129,7 @@ static int open_collection(struct hid_parser *parser, unsigned type) 
		collection = kmalloc(sizeof(struct hid_collection) *

				parser->device->collection_size * 2, GFP_KERNEL);

		if (collection == NULL) {

			dbg_hid("failed to reallocate collection array\n");

			hid_err(parser->device, "failed to reallocate collection array\n");

			return -1;

		}

		memcpy(collection, parser->device->collection,
@@ -165,7 +165,7 @@ static int open_collection(struct hid_parser *parser, unsigned type) 
static int close_collection(struct hid_parser *parser)

{

	if (!parser->collection_stack_ptr) {

		dbg_hid("collection stack underflow\n");

		hid_err(parser->device, "collection stack underflow\n");

		return -1;

	}

	parser->collection_stack_ptr--;
@@ -197,7 +197,7 @@ static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type) 
static int hid_add_usage(struct hid_parser *parser, unsigned usage)

{

	if (parser->local.usage_index >= HID_MAX_USAGES) {

		dbg_hid("usage index exceeded\n");

		hid_err(parser->device, "usage index exceeded\n");

		return -1;

	}

	parser->local.usage[parser->local.usage_index] = usage;
@@ -222,12 +222,13 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign 


	report = hid_register_report(parser->device, report_type, parser->global.report_id);

	if (!report) {

		dbg_hid("hid_register_report failed\n");

		hid_err(parser->device, "hid_register_report failed\n");

		return -1;

	}



	if (parser->global.logical_maximum < parser->global.logical_minimum) {

		dbg_hid("logical range invalid %d %d\n", parser->global.logical_minimum, parser->global.logical_maximum);

		hid_err(parser->device, "logical range invalid %d %d\n",

				parser->global.logical_minimum, parser->global.logical_maximum);

		return -1;

	}
@@ -307,7 +308,7 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) 
	case HID_GLOBAL_ITEM_TAG_PUSH:



		if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) {

			dbg_hid("global environment stack overflow\n");

			hid_err(parser->device, "global environment stack overflow\n");

			return -1;

		}
@@ -318,7 +319,7 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) 
	case HID_GLOBAL_ITEM_TAG_POP:



		if (!parser->global_stack_ptr) {

			dbg_hid("global environment stack underflow\n");

			hid_err(parser->device, "global environment stack underflow\n");

			return -1;

		}
@@ -363,7 +364,7 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) 
	case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:

		parser->global.report_size = item_udata(item);

		if (parser->global.report_size > 96) {

			dbg_hid("invalid report_size %d\n",

			hid_err(parser->device, "invalid report_size %d\n",

					parser->global.report_size);

			return -1;

		}
@@ -372,7 +373,7 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) 
	case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:

		parser->global.report_count = item_udata(item);

		if (parser->global.report_count > HID_MAX_USAGES) {

			dbg_hid("invalid report_count %d\n",

			hid_err(parser->device, "invalid report_count %d\n",

					parser->global.report_count);

			return -1;

		}
@@ -381,13 +382,13 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) 
	case HID_GLOBAL_ITEM_TAG_REPORT_ID:

		parser->global.report_id = item_udata(item);

		if (parser->global.report_id == 0) {

			dbg_hid("report_id 0 is invalid\n");

			hid_err(parser->device, "report_id 0 is invalid\n");

			return -1;

		}

		return 0;



	default:

		dbg_hid("unknown global tag 0x%x\n", item->tag);

		hid_err(parser->device, "unknown global tag 0x%x\n", item->tag);

		return -1;

	}

}
@@ -414,14 +415,14 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) 
			 * items and the first delimiter set.

			 */

			if (parser->local.delimiter_depth != 0) {

				dbg_hid("nested delimiters\n");

				hid_err(parser->device, "nested delimiters\n");

				return -1;

			}

			parser->local.delimiter_depth++;

			parser->local.delimiter_branch++;

		} else {

			if (parser->local.delimiter_depth < 1) {

				dbg_hid("bogus close delimiter\n");

				hid_err(parser->device, "bogus close delimiter\n");

				return -1;

			}

			parser->local.delimiter_depth--;
@@ -506,7 +507,7 @@ static int hid_parser_main(struct hid_parser *parser, struct hid_item *item) 
		ret = hid_add_field(parser, HID_FEATURE_REPORT, data);

		break;

	default:

		dbg_hid("unknown main item tag 0x%x\n", item->tag);

		hid_err(parser->device, "unknown main item tag 0x%x\n", item->tag);

		ret = 0;

	}
@@ -678,12 +679,12 @@ int hid_parse_report(struct hid_device *device, __u8 *start, 
	while ((start = fetch_item(start, end, &item)) != NULL) {



		if (item.format != HID_ITEM_FORMAT_SHORT) {

			dbg_hid("unexpected long global item\n");

			hid_err(device, "unexpected long global item\n");

			goto err;

		}



		if (dispatch_type[item.type](parser, &item)) {

			dbg_hid("item %u %u %u %u parsing failed\n",

			hid_err(device, "item %u %u %u %u parsing failed\n",

				item.format, (unsigned)item.size,

				(unsigned)item.type, (unsigned)item.tag);

			goto err;
@@ -691,11 +692,11 @@ int hid_parse_report(struct hid_device *device, __u8 *start, 


		if (start == end) {

			if (parser->collection_stack_ptr) {

				dbg_hid("unbalanced collection at end of report description\n");

				hid_err(device, "unbalanced collection at end of report description\n");

				goto err;

			}

			if (parser->local.delimiter_depth) {

				dbg_hid("unbalanced delimiter at end of report description\n");

				hid_err(device, "unbalanced delimiter at end of report description\n");

				goto err;

			}

			vfree(parser);
@@ -703,7 +704,7 @@ int hid_parse_report(struct hid_device *device, __u8 *start, 
		}

	}



	dbg_hid("item fetching failed at offset %d\n", (int)(end - start));

	hid_err(device, "item fetching failed at offset %d\n", (int)(end - start));

err:

	vfree(parser);

	return ret;
@@ -873,7 +874,7 @@ static void hid_process_event(struct hid_device *hid, struct hid_field *field, 
		ret = hdrv->event(hid, field, usage, value);

		if (ret != 0) {

			if (ret < 0)

				dbg_hid("%s's event failed with %d\n",

				hid_err(hid, "%s's event failed with %d\n",

						hdrv->name, ret);

			return;

		}
@@ -995,12 +996,13 @@ int hid_set_field(struct hid_field *field, unsigned offset, __s32 value) 
	hid_dump_input(field->report->device, field->usage + offset, value);



	if (offset >= field->report_count) {

		dbg_hid("offset (%d) exceeds report_count (%d)\n", offset, field->report_count);

		hid_err(field->report->device, "offset (%d) exceeds report_count (%d)\n",

				offset, field->report_count);

		return -1;

	}

	if (field->logical_minimum < 0) {

		if (value != snto32(s32ton(value, size), size)) {

			dbg_hid("value %d is out of range\n", value);

			hid_err(field->report->device, "value %d is out of range\n", value);

			return -1;

		}

	}

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