linux-kernel - [PATCH v1 1/1] PM: Avoid false-positive warnings in dev_pm_domain

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Date:	Mon,  1 Feb 2016 16:12:58 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] PM: Avoid false-positive warnings in dev_pm_domain_set()

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

There is a WARN_ON() in dev_pm_domain_set() that triggers on attempts
to set the pm_domain pointer for devices with a driver bound.

However, that WARN_ON() triggers on attempts to clear the pointer
too and the test it uses is based on checking the device's
p->knode_driver pointer which still is set when the device bus
type's/driver's ->remove callback has been executed.  This
leads to false-positive warnings when bus type code calls
dev_pm_domain_set() to clear the pm_domain pointer after
invoking the driver's ->remove() callback.

To avoid those false-positives, make dev_pm_domain_set() check
if the pointer passed to it is NULL and skip the warning in
that case.

Fixes: 989561de9b51 (PM / Domains: add setter for dev.pm_domain)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/base/power/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index 93ed14c..f6a9ad5 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -146,7 +146,7 @@ void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd)
 	if (dev->pm_domain == pd)
 		return;

-	WARN(device_is_bound(dev),
+	WARN(pd && device_is_bound(dev),
 	     "PM domains can only be changed for unbound devices\n");
 	dev->pm_domain = pd;
 	device_pm_check_callbacks(dev);
-- 
2.7.0