linux-kernel - [PATCH AUTOSEL for 4.14 048/100] PM / runtime: Fix handling of suppliers with disabled runtime PM

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Date:   Sun, 28 Jan 2018 22:26:30 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 048/100] PM / runtime: Fix handling of
 suppliers with disabled runtime PM

From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>

[ Upstream commit 31eb7431805493e10f4731f366cf4d4e3e952035 ]

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@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Lukas Wunner <lukas@...ner.de>
Tested-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/base/power/runtime.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 7bcf80fa9ada..b2b1eece0db1 100644
--- 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;
 		}
-- 
2.11.0