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HID: non-overlapping zeroing of extra bits

Message ID 20100412121611.4d8ff409@redhat.com (mailing list archive)
State New, archived
Delegated to: Jiri Kosina
Headers show

Commit Message

Pete Zaitcev April 12, 2010, 6:16 p.m. UTC
None
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Patch

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -940,13 +940,8 @@  static void hid_output_field(struct hid_field *field, __u8 *data)
 	unsigned count = field->report_count;
 	unsigned offset = field->report_offset;
 	unsigned size = field->report_size;
-	unsigned bitsused = offset + count * size;
 	unsigned n;
 
-	/* make sure the unused bits in the last byte are zeros */
-	if (count > 0 && size > 0 && (bitsused % 8) != 0)
-		data[(bitsused-1)/8] &= (1 << (bitsused % 8)) - 1;
-
 	for (n = 0; n < count; n++) {
 		if (field->logical_minimum < 0)	/* signed values */
 			implement(data, offset + n * size, size, s32ton(field->value[n], size));
@@ -966,6 +961,7 @@  void hid_output_report(struct hid_report *report, __u8 *data)
 	if (report->id > 0)
 		*data++ = report->id;
 
+	memset(data, 0, ((report->size - 1) >> 3) + 1);
 	for (n = 0; n < report->maxfield; n++)
 		hid_output_field(report->field[n], data);
 }