linux-kernel - [PATCH 6/16] ACPI: Change the ordering of acpi_bus_check

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Message-ID: <2653336.2sGpJboDsC@vostro.rjw.lan>
Date:	Thu, 20 Dec 2012 02:51:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Toshi Kani <toshi.kani@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing0307@...il.com>,
	Jiang Liu <liuj97@...il.com>
Subject: [PATCH 6/16] ACPI: Change the ordering of acpi_bus_check_add()

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


If acpi_bus_check_add() is called for a handle already having an
existing struct acpi_device object attached, it is not necessary to
check the type and status of the device correspondig to it, so
change the ordering of acpi_bus_check_add() to avoid that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Acked-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/acpi/scan.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Index: linux/drivers/acpi/scan.c
===================================================================
--- linux.orig/drivers/acpi/scan.c
+++ linux/drivers/acpi/scan.c
@@ -1582,6 +1582,10 @@ static acpi_status acpi_bus_check_add(ac
 	acpi_status status;
 	int result;
 
+	acpi_bus_get_device(handle, &device);
+	if (device)
+		goto out;
+
 	result = acpi_bus_type_and_status(handle, &type, &sta);
 	if (result)
 		return AE_OK;
@@ -1598,18 +1602,14 @@ static acpi_status acpi_bus_check_add(ac
 		return AE_CTRL_DEPTH;
 	}
 
-	acpi_bus_get_device(handle, &device);
-	if (!device) {
-		acpi_add_single_object(&device, handle, type, sta,
-				       ACPI_BUS_ADD_BASIC);
-		if (!device)
-			return AE_CTRL_DEPTH;
+	acpi_add_single_object(&device, handle, type, sta, ACPI_BUS_ADD_BASIC);
+	if (!device)
+		return AE_CTRL_DEPTH;
 
-		device->add_type = context ?
-					ACPI_BUS_ADD_START : ACPI_BUS_ADD_MATCH;
-		acpi_hot_add_bind(device);
-	}
+	device->add_type = context ? ACPI_BUS_ADD_START : ACPI_BUS_ADD_MATCH;
+	acpi_hot_add_bind(device);
 
+ out:
 	if (!*return_value)
 		*return_value = device;
 

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