1 files changed, 36 insertions, 1 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index d44065d2e662..e54e002665b0 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -29,6 +29,23 @@ MODULE_LICENSE("GPL");
 
 #define INPUT_DEVICES	256
 
+/*
+ * EV_ABS events which should not be cached are listed here.
+ */
+static unsigned int input_abs_bypass_init_data[] __initdata = {
+	ABS_MT_TOUCH_MAJOR,
+	ABS_MT_TOUCH_MINOR,
+	ABS_MT_WIDTH_MAJOR,
+	ABS_MT_WIDTH_MINOR,
+	ABS_MT_ORIENTATION,
+	ABS_MT_POSITION_X,
+	ABS_MT_POSITION_Y,
+	ABS_MT_TOOL_TYPE,
+	ABS_MT_BLOB_ID,
+	0
+};
+static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
+
 static LIST_HEAD(input_dev_list);
 static LIST_HEAD(input_handler_list);
 
@@ -161,6 +178,10 @@ static void input_handle_event(struct input_dev *dev,
 				disposition = INPUT_PASS_TO_HANDLERS;
 			}
 			break;
+		case SYN_MT_REPORT:
+			dev->sync = 0;
+			disposition = INPUT_PASS_TO_HANDLERS;
+			break;
 		}
 		break;
 
@@ -192,6 +213,11 @@ static void input_handle_event(struct input_dev *dev,
 	case EV_ABS:
 		if (is_event_supported(code, dev->absbit, ABS_MAX)) {
 
+			if (test_bit(code, input_abs_bypass)) {
+				disposition = INPUT_PASS_TO_HANDLERS;
+				break;
+			}
+
 			value = input_defuzz_abs_event(value,
 					dev->abs[code], dev->absfuzz[code]);
 
@@ -1549,7 +1575,6 @@ int input_register_handle(struct input_handle *handle)
 		return error;
 	list_add_tail_rcu(&handle->d_node, &dev->h_list);
 	mutex_unlock(&dev->mutex);
-	synchronize_rcu();
 
 	/*
 	 * Since we are supposed to be called from ->connect()
@@ -1635,10 +1660,20 @@ static const struct file_operations input_fops = {
 	.open = input_open_file,
 };
 
+static void __init input_init_abs_bypass(void)
+{
+	const unsigned int *p;
+
+	for (p = input_abs_bypass_init_data; *p; p++)
+		input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
+}
+
 static int __init input_init(void)
 {
 	int err;
 
+	input_init_abs_bypass();
+
 	err = class_register(&input_class);
 	if (err) {
 		printk(KERN_ERR "input: unable to register input_dev class\n");