PM / Sleep: fix recovery during resuming from hibernation

If a device's dev_pm_ops::freeze callback fails during the QUIESCE
phase, we don't rollback things correctly calling the thaw and complete
callbacks. This could leave some devices in a suspended state in case of
an error during resuming from hibernation.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index a9dfa79..1f35a34 100644 (file)
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -502,8 +502,14 @@ int hibernation_restore(int platform_mode)
        error = dpm_suspend_start(PMSG_QUIESCE);
        if (!error) {
                error = resume_target_kernel(platform_mode);
-               dpm_resume_end(PMSG_RECOVER);
+               /*
+                * The above should either succeed and jump to the new kernel,
+                * or return with an error. Otherwise things are just
+                * undefined, so let's be paranoid.
+                */
+               BUG_ON(!error);
        }
+       dpm_resume_end(PMSG_RECOVER);
        pm_restore_gfp_mask();
        resume_console();
        pm_restore_console();