PM / Domains: Respect errors from genpd's ->power_off() callback

The current code in genpd_sync_power_off(), doesn't care about potential
errors being returned from genpd's ->power_off() callback.

Obviously this behaviour could lead to problems, such as incorrectly
setting the genpd's status to GPD_STATE_POWER_OFF, but also to incorrectly
decrease the subdomain count for the masters, which potentially allows them
to be powered off in the next recursive call to genpd_sync_power_off().

Let's fix this behaviour by bailing out when the ->power_off() callback
returns an error code.

Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Viresh Kumar <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: storulf

drivers/base/power/domain.c

@@ -767,7 +767,8 @@ static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
 
 	/* Choose the deepest state when suspending */
 	genpd->state_idx = genpd->state_count - 1;
-	_genpd_power_off(genpd, false);
+	if (_genpd_power_off(genpd, false))
+		return;
 
 	genpd->status = GPD_STATE_POWER_OFF;