linux-kernel - [RFC][PATCH 14/30] ACPI / hotplug / PCI: Drop flags field from struct acpiphp

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Date:	Fri, 12 Jul 2013 01:54:01 +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 14/30] ACPI / hotplug / PCI: Drop flags field from struct acpiphp_bridge

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

The only bridge flag used by the ACPI-based PCI hotplug (ACPIPHP)
code is BRIDGE_HAS_EJ0, but it is only used by the event handling
function hotplug_event() and if that flag is set, the corresponding
function flag FUNC_HAS_EJ0 is set as well, so that bridge flag is
redundant.

For this reason, drop BRIDGE_HAS_EJ0 and all code referring to it
and since it is the only bridge flag defined, drop the flags field
from struct acpiphp_bridge entirely.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/pci/hotplug/acpiphp.h      |    5 -----
 drivers/pci/hotplug/acpiphp_glue.c |    9 ---------
 2 files changed, 14 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;
 
-	u32 flags;
-
 	/* This bus (host bridge) or Secondary bus (PCI-to-PCI bridge) */
 	struct pci_bus *pci_bus;
 
@@ -152,9 +150,6 @@ struct acpiphp_attention_info
 /* ACPI _STA method value (ignore bit 4; battery present) */
 #define ACPI_STA_ALL			(0x0000000f)
 
-/* bridge flags */
-#define BRIDGE_HAS_EJ0		(0x00000001)
-
 /* slot flags */
 
 #define SLOT_POWEREDON		(0x00000001)
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
@@ -1009,9 +1009,6 @@ static void hotplug_event(acpi_handle ha
 	case ACPI_NOTIFY_EJECT_REQUEST:
 		/* request device eject */
 		dbg("%s: Device eject notify on %s\n", __func__, objname);
-		if (bridge && !(bridge->flags & BRIDGE_HAS_EJ0))
-			break;
-
 		if (!(acpiphp_disable_slot(func->slot)))
 			acpiphp_eject_slot(func->slot);
 
@@ -1148,12 +1145,6 @@ void acpiphp_enumerate_slots(struct pci_
 		mutex_unlock(&acpiphp_context_lock);
 	}
 
-	status = acpi_get_handle(bridge->handle, "_EJ0", &handle);
-	if (ACPI_SUCCESS(status)) {
-		dbg("found ejectable p2p bridge\n");
-		bridge->flags |= BRIDGE_HAS_EJ0;
-	}
-
 	/* must be added to the list prior to calling register_slot */
 	mutex_lock(&bridge_mutex);
 	list_add(&bridge->list, &bridge_list);

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