PM: Reintroduce dropped call to check_wakeup_irqs

Patch 2e711c04dbbf7a7732a3f7073b1fc285d12b369d
(PM: Remove sysdev suspend, resume and shutdown operations)
deleted sysdev_suspend(), which was being relied on to call
check_wakeup_irqs() in suspend.  If check_wakeup_irqs() is not
called, wake interrupts that are pending when suspend is
entered may be lost.  It also breaks IRQCHIP_MASK_ON_SUSPEND,
which is handled in check_wakeup_irqs().

This patch adds a call to check_wakeup_irqs() in syscore_suspend(),
similar to what was deleted in sysdev_suspend().

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c
index c126db3..e8d11b6 100644 (file)
--- a/drivers/base/syscore.c
+++ b/drivers/base/syscore.c
@@ -9,6 +9,7 @@
 #include <linux/syscore_ops.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/interrupt.h>
 
 static LIST_HEAD(syscore_ops_list);
 static DEFINE_MUTEX(syscore_ops_lock);
@@ -48,6 +49,13 @@ int syscore_suspend(void)
        struct syscore_ops *ops;
        int ret = 0;
 
+       pr_debug("Checking wakeup interrupts\n");
+
+       /* Return error code if there are any wakeup interrupts pending. */
+       ret = check_wakeup_irqs();
+       if (ret)
+               return ret;
+
        WARN_ONCE(!irqs_disabled(),
                "Interrupts enabled before system core suspend.\n");