linux-kernel - Re: [PATCH] PM / Domains: Only check for errors when calling dev_pm_get_subsys

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Date:	Sun, 5 Aug 2012 23:13:46 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / Domains: Only check for errors when calling dev_pm_get_subsys_data

On Sunday, August 05, 2012, Heiko Stübner wrote:
> Commit 1d5fcfec22 (PM / Domains: Add device domain data reference counter)
> added a check for the return value of dev_pm_get_subsys_data.
> 
> But this function does not only return error codes but also "1" when a
> new object has been created.
> 
> So, change the check to only catch real errors.
> 
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>

Good catch!

Applied to the linux-next branch of the linux-pm.git tree.  I'm going to
push it as a fix for v3.6.

However, there's one more analogous fix necessary, for which I'm going to
apply the appended patch.

Thanks,
Rafael


---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: PM / Domains: Fix one more dev_pm_get_subsys_data() return value check

The check agains the return value of dev_pm_get_subsys_data()
in pm_genpd_add_callbacks() should be modified so that non-negative
values are not regarded as errors, because dev_pm_get_subsys_data()
returns 1 if it successfully creates a new object.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/base/power/domain.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/base/power/domain.c
===================================================================
--- linux.orig/drivers/base/power/domain.c
+++ linux/drivers/base/power/domain.c
@@ -1691,7 +1691,7 @@ int pm_genpd_add_callbacks(struct device
 	device_pm_lock();
 
 	ret = dev_pm_get_subsys_data(dev);
-	if (ret)
+	if (ret < 0)
 		goto out;
 
 	spin_lock_irq(&dev->power.lock);
--
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