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

[ Upstream commit 31eb743180 ]

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: 21d5c57b37 (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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Rafael J. Wysocki 2017-12-01 14:58:34 +01:00 committed by Greg Kroah-Hartman
parent 8b9d371a8c
commit 0b028b06af
1 changed files with 2 additions and 1 deletions
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3
drivers/base/power/runtime.c
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@ -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;
}