From 0ef957026211891ccdce0116584720b8d1c0c94d Mon Sep 17 00:00:00 2001
From: Henrik Rydberg <rydberg@euromail.se>
Date: Wed, 23 Jun 2010 10:09:26 -0700
Subject: [PATCH] --- yaml --- r: 202180 b: refs/heads/master c:
 e725a4945d6eedd400dd5d0ead293d980a2f76ec h: refs/heads/master v: v3

---
 [refs]                      |  2 +-
 trunk/drivers/input/evdev.c | 10 +++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index 7f3cadeb9361..9aecf15be14a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6967b4d9de4a7cf3b00cd9a93981d3206d75a1d8
+refs/heads/master: e725a4945d6eedd400dd5d0ead293d980a2f76ec
diff --git a/trunk/drivers/input/evdev.c b/trunk/drivers/input/evdev.c
index 30836c05edd7..cd323254ca6f 100644
--- a/trunk/drivers/input/evdev.c
+++ b/trunk/drivers/input/evdev.c
@@ -54,11 +54,15 @@ static void evdev_pass_event(struct evdev_client *client,
 			     struct input_event *event)
 {
 	/*
-	 * Interrupts are disabled, just acquire the lock
+	 * Interrupts are disabled, just acquire the lock.
+	 * Make sure we don't leave with the client buffer
+	 * "empty" by having client->head == client->tail.
 	 */
 	spin_lock(&client->buffer_lock);
-	client->buffer[client->head++] = *event;
-	client->head &= client->bufsize - 1;
+	do {
+		client->buffer[client->head++] = *event;
+		client->head &= client->bufsize - 1;
+	} while (client->head == client->tail);
 	spin_unlock(&client->buffer_lock);
 
 	if (event->type == EV_SYN)