freezer: introduce freezer-friendly waiting macros

Introduce freezer-friendly wrappers around wait_event_interruptible() and
wait_event_interruptible_timeout(), originally defined in <linux/wait.h>, to
be used in freezable kernel threads.  Make some of the freezable kernel
threads use them.

This is necessary for the freezer to stop sending signals to kernel threads,
which is implemented in the next patch.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 3 insertions, 6 deletions

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 20896d5e5f0..ec1b6cfefcd 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -448,9 +448,8 @@ static int gameport_thread(void *nothing)
         set_freezable();
         do {
                 gameport_handle_event();
-                wait_event_interruptible(gameport_wait,
+                wait_event_freezable(gameport_wait,
                         kthread_should_stop() || !list_empty(&gameport_event_list));
-                try_to_freeze();
         } while (!kthread_should_stop());
 
         printk(KERN_DEBUG "gameport: kgameportd exiting\n");
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index b3bc15acd3f..7f5293828fb 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -387,9 +387,8 @@ static int serio_thread(void *nothing)
         set_freezable();
         do {
                 serio_handle_event();
-                wait_event_interruptible(serio_wait,
+                wait_event_freezable(serio_wait,
                         kthread_should_stop() || !list_empty(&serio_event_list));
-                try_to_freeze();
         } while (!kthread_should_stop());
 
         printk(KERN_DEBUG "serio: kseriod exiting\n");
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index 86aed64ec0f..89373b01d8f 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -333,10 +333,9 @@ static int ucb1400_ts_thread(void *_ucb)
                         timeout = msecs_to_jiffies(10);
                 }
 
-                wait_event_interruptible_timeout(ucb->ts_wait,
+                wait_event_freezable_timeout(ucb->ts_wait,
                         ucb->irq_pending || ucb->ts_restart || kthread_should_stop(),
                         timeout);
-                try_to_freeze();
         }
 
         /* Send the "pen off" if we are stopping with the pen still active */