PM: device_suspend/resume may sleep

This adds warning when someone tries them from atomic context.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/base/power/suspend.c b/drivers/base/power/suspend.c
index 6453c25103d2..ece136bf97e3 100644
--- a/drivers/base/power/suspend.c
+++ b/drivers/base/power/suspend.c
@@ -140,6 +140,7 @@ int device_suspend(pm_message_t state)
 {
         int error = 0;
 
+        might_sleep();
         down(&dpm_sem);
         down(&dpm_list_sem);
         while (!list_empty(&dpm_active) && error == 0) {