PM / runtime: Fix handling of suppliers with disabled runtime PM

Prevent rpm_get_suppliers() from returning an error code if runtime
PM is disabled for one or more of the supplier devices it wants to
runtime-resume, so as to make runtime PM work for devices with links
to suppliers that don't use runtime PM (such links may be created
during device enumeration even before it is known whether or not
runtime PM will be enabled for the devices in question, for example).

Fixes: 21d5c57b3726 (PM / runtime: Use device links)
Reported-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Tested-by: Adrian Hunter <adrian.hunter@intel.com>

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 027d159ac3810e9b5b190345c1bee60dbbc13790..6e89b51ea3d92b40eba2059bfdb47703916454d9 100644 (file)
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -276,7 +276,8 @@ static int rpm_get_suppliers(struct device *dev)
                        continue;
 
                retval = pm_runtime_get_sync(link->supplier);
-               if (retval < 0) {
+               /* Ignore suppliers with disabled runtime PM. */
+               if (retval < 0 && retval != -EACCES) {
                        pm_runtime_put_noidle(link->supplier);
                        return retval;
                }