linux-kernel - [RFC][PATCH 6/30] ACPI / hotplug / PCI: Rework acpiphp_handle_to

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Date:	Fri, 12 Jul 2013 01:44:48 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>, Jiang Liu <liuj97@...il.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [RFC][PATCH 6/30] ACPI / hotplug / PCI: Rework acpiphp_handle_to_bridge()

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

Using the hotplug context objects introduced previously rework the
ACPI-based PCI hotplug (ACPIPHP) core code to get to acpiphp_bridge
objects associated with hotplug bridges from those context objects
rather than from the global list of hotplug bridges.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/pci/hotplug/acpiphp_glue.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
+++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
@@ -464,18 +464,20 @@ static int detect_ejectable_slots(acpi_h
 
 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 {
-	struct acpiphp_bridge *bridge;
+	struct acpiphp_context *context;
+	struct acpiphp_bridge *bridge = NULL;
 
-	mutex_lock(&bridge_mutex);
-	list_for_each_entry(bridge, &bridge_list, list)
-		if (bridge->handle == handle) {
+	mutex_lock(&acpiphp_context_lock);
+	context = acpiphp_get_context(handle);
+	if (context) {
+		bridge = context->bridge;
+		if (bridge)
 			get_bridge(bridge);
-			mutex_unlock(&bridge_mutex);
-			return bridge;
-		}
-	mutex_unlock(&bridge_mutex);
 
-	return NULL;
+		acpiphp_put_context(context);
+	}
+	mutex_unlock(&acpiphp_context_lock);
+	return bridge;
 }
 
 static void cleanup_bridge(struct acpiphp_bridge *bridge)

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