linux-kernel - [PATCH 2/2] ACPI: Print diagnostic messages if device links cannot be created

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Date:	Thu, 08 Aug 2013 01:55:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: [PATCH 2/2] ACPI: Print diagnostic messages if device links cannot be created

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

Although the device links created by acpi_bind_one() are not
essential from the kernel functionality point of view, user space
may be confused when they are missing, so print diagnostic messages
to the kernel log if they can't be created.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/glue.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-pm/drivers/acpi/glue.c
===================================================================
--- linux-pm.orig/drivers/acpi/glue.c
+++ linux-pm/drivers/acpi/glue.c
@@ -252,8 +252,15 @@ int acpi_bind_one(struct device *dev, ac
 	acpi_physnode_link_name(physical_node_name, node_id);
 	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
 				   physical_node_name);
+	if (retval)
+		dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
+			physical_node_name, retval);
+
 	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
 				   "firmware_node");
+	if (retval)
+		dev_err(dev, "Failed to create link firmware_node (%d)\n",
+			retval);
 
 	mutex_unlock(&acpi_dev->physical_node_lock);
 

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