Input: i8042 - fix KBC jam during hibernate

633aae2 "Input: i8042 - switch to using dev_pm_ops" removed handling
for PMSG_THAW, since we do not need to do anything during freeze and
thus it was thougt that thaw is not needed as well. However, there is
a period when interrupts are kept off, and if key happens to be pressed
during that time KBC becomes jammed. To avoid the jam we simply need
to poll KBC once during thaw.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/serio/i8042.c

@@ -1161,9 +1161,17 @@ static int i8042_pm_restore(struct device *dev)
 	return 0;
 }
 
+static int i8042_pm_thaw(struct device *dev)
+{
+	i8042_interrupt(0, NULL);
+
+	return 0;
+}
+
 static const struct dev_pm_ops i8042_pm_ops = {
 	.suspend	= i8042_pm_reset,
 	.resume		= i8042_pm_restore,
+	.thaw		= i8042_pm_thaw,
 	.poweroff	= i8042_pm_reset,
 	.restore	= i8042_pm_restore,
 };