[git pull 12/14] Input - help swsusp

[Dmitry Torokhov]

Input: make serio and gameport more swsusp friendly

kseriod and kgameportd used to process all pending events before
checking for freeze condition. This may cause swsusp to time out
while stopping tasks when resuming. Switch to process events one
by one to check freeze status more often.

Signed-off-by: Dmitry Torokhov <dtor@xxxxxxx>
---

 drivers/input/gameport/gameport.c |   12 +++++++++---
 drivers/input/serio/serio.c       |   12 +++++++++---
 2 files changed, 18 insertions(+), 6 deletions(-)

Index: work/drivers/input/serio/serio.c
===================================================================
--- work.orig/drivers/input/serio/serio.c
+++ work/drivers/input/serio/serio.c
@@ -269,14 +269,20 @@ static struct serio_event *serio_get_eve
 	return event;
 }
 
-static void serio_handle_events(void)
+static void serio_handle_event(void)
 {
 	struct serio_event *event;
 	struct serio_driver *serio_drv;
 
 	down(&serio_sem);
 
-	while ((event = serio_get_event())) {
+	/*
+	 * Note that we handle only one event here to give swsusp
+	 * a chance to freeze kseriod thread. Serio events should
+	 * be pretty rare so we are not concerned about taking
+	 * performance hit.
+	 */
+	if ((event = serio_get_event())) {
 
 		switch (event->type) {
 			case SERIO_REGISTER_PORT:
@@ -368,7 +374,7 @@ static struct serio *serio_get_pending_c
 static int serio_thread(void *nothing)
 {
 	do {
-		serio_handle_events();
+		serio_handle_event();
 		wait_event_interruptible(serio_wait,
 			kthread_should_stop() || !list_empty(&serio_event_list));
 		try_to_freeze();
Index: work/drivers/input/gameport/gameport.c
===================================================================
--- work.orig/drivers/input/gameport/gameport.c
+++ work/drivers/input/gameport/gameport.c
@@ -339,14 +339,20 @@ static struct gameport_event *gameport_g
 	return event;
 }
 
-static void gameport_handle_events(void)
+static void gameport_handle_event(void)
 {
 	struct gameport_event *event;
 	struct gameport_driver *gameport_drv;
 
 	down(&gameport_sem);
 
-	while ((event = gameport_get_event())) {
+	/*
+	 * Note that we handle only one event here to give swsusp
+	 * a chance to freeze kgameportd thread. Gameport events
+	 * should be pretty rare so we are not concerned about
+	 * taking performance hit.
+	 */
+	if ((event = gameport_get_event())) {
 
 		switch (event->type) {
 			case GAMEPORT_REGISTER_PORT:
@@ -433,7 +439,7 @@ static struct gameport *gameport_get_pen
 static int gameport_thread(void *nothing)
 {
 	do {
-		gameport_handle_events();
+		gameport_handle_event();
 		wait_event_interruptible(gameport_wait,
 			kthread_should_stop() || !list_empty(&gameport_event_list));
 		try_to_freeze();

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/