ARM: pxa: only save/restore registers when pm functions are defined

Reported-and-tested-by: Sven Neumann <s.neumann@raumfeld.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

diff --git a/arch/arm/mach-pxa/pm.c b/arch/arm/mach-pxa/pm.c
index 978e1b2..1807c9a 100644 (file)
--- a/arch/arm/mach-pxa/pm.c
+++ b/arch/arm/mach-pxa/pm.c
@@ -33,7 +33,7 @@ int pxa_pm_enter(suspend_state_t state)
 #endif
 
        /* skip registers saving for standby */
-       if (state != PM_SUSPEND_STANDBY) {
+       if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
                pxa_cpu_pm_fns->save(sleep_save);
                /* before sleeping, calculate and save a checksum */
                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
@@ -44,7 +44,7 @@ int pxa_pm_enter(suspend_state_t state)
        pxa_cpu_pm_fns->enter(state);
        cpu_init();
 
-       if (state != PM_SUSPEND_STANDBY) {
+       if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
                /* after sleeping, validate the checksum */
                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
                        checksum += sleep_save[i];