linux-kernel - [RFC][PATCH 13/30] ACPI / hotplug / PCI: Use common slot count variable in register

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Date:	Fri, 12 Jul 2013 01:52:30 +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 13/30] ACPI / hotplug / PCI: Use common slot count variable in register_slot()

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

It is not necessary to use per-bridge slot count fields just in
order to label slots for devices without _SUN, so use a common
static slot_count variable for this purpose and drop the nr_slots
field from struct acpiphp_bridge.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/pci/hotplug/acpiphp.h      |    2 --
 drivers/pci/hotplug/acpiphp_glue.c |    7 ++++---
 2 files changed, 4 insertions(+), 5 deletions(-)

Index: linux-pm/drivers/pci/hotplug/acpiphp.h
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp.h
+++ linux-pm/drivers/pci/hotplug/acpiphp.h
@@ -80,8 +80,6 @@ struct acpiphp_bridge {
 
 	struct acpiphp_context *context;
 
-	int nr_slots;
-
 	u32 flags;
 
 	/* This bus (host bridge) or Secondary bus (PCI-to-PCI bridge) */
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
@@ -346,20 +346,21 @@ static acpi_status register_slot(acpi_ha
 
 	/* Register slots for ejectable funtions only. */
 	if (acpi_pci_check_ejectable(pbus, handle)  || is_dock_device(handle)) {
+		static unsigned int slot_count;
 		unsigned long long sun;
 		int retval;
 
-		bridge->nr_slots++;
+		slot_count++;
 		status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 		if (ACPI_FAILURE(status))
-			sun = bridge->nr_slots;
+			sun = slot_count;
 
 		dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
 		    sun, pci_domain_nr(pbus), pbus->number, device);
 
 		retval = acpiphp_register_hotplug_slot(slot, sun);
 		if (retval) {
-			bridge->nr_slots--;
+			slot_count--;
 			if (retval == -EBUSY)
 				warn("Slot %llu already registered by another "
 					"hotplug driver\n", sun);

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