Thread (17 messages) 17 messages, 4 authors, 2016-04-27

[PATCH] Input: Do not add SYN_REPORT in between a single packet data

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From: Aniroop Mathur <hidden>
Date: 2016-03-07 17:41:14
Also in: lkml
Subsystem: input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers: Dmitry Torokhov, Linus Torvalds

As mentioned in documentation, SYN_REPORT should be used to separate two packets
and should not be inserted in between a single packet as otherwise with multiple
SYN_REPORT in a single packet, input reader would not be able to know when the
packet ended really.

Documentation snippet:
* SYN_REPORT:
  - Used to synchronize and separate events into packets of input data changes
    occurring at the same moment in time. For example, motion of a mouse may set
    the REL_X and REL_Y values for one motion, then emit a SYN_REPORT. The next
    motion will emit more REL_X and REL_Y values and send another SYN_REPORT.

Signed-off-by: Aniroop Mathur <redacted>
---
 drivers/input/input.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 8806059..262ef77 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -401,8 +401,7 @@ static void input_handle_event(struct input_dev *dev,
 		if (dev->num_vals >= 2)
 			input_pass_values(dev, dev->vals, dev->num_vals);
 		dev->num_vals = 0;
-	} else if (dev->num_vals >= dev->max_vals - 2) {
-		dev->vals[dev->num_vals++] = input_value_sync;
+	} else if (dev->num_vals >= dev->max_vals - 1) {
 		input_pass_values(dev, dev->vals, dev->num_vals);
 		dev->num_vals = 0;
 	}
-- 
2.6.2
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