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From: Jiang Liu <liuj97@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
	Don Dutile <ddutile@redhat.com>, Yinghai Lu <yinghai@kernel.org>,
	Greg KH <gregkh@linuxfoundation.org>,
	Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>,
	Taku Izumi <izumi.taku@jp.fujitsu.com>,
	"Rafael J . Wysocki" <rjw@sisk.pl>,
	Yijing Wang <wangyijing@huawei.com>,
	Xinwei Hu <huxinwei@huawei.com>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	Jiang Liu <liuj97@gmail.com>
Subject: [RFC PATCH v1 10/22] PCI: enhance PCI bus specific logic to support PCI bus lock mechanism
Date: Wed,  8 Aug 2012 00:10:50 +0800	[thread overview]
Message-ID: <1344355862-2726-11-git-send-email-jiang.liu@huawei.com> (raw)
In-Reply-To: <1344355862-2726-1-git-send-email-jiang.liu@huawei.com>

This patch enhances PCI bus specific logic to support PCI bus lock mechanism.

Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
 drivers/pci/bus.c |   54 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 31 insertions(+), 23 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index b6aacaa..371f20a 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -185,19 +185,20 @@ int pci_bus_add_device(struct pci_dev *dev)
  */
 int pci_bus_add_child(struct pci_bus *bus)
 {
-	int retval;
-
-	if (bus->bridge)
-		bus->dev.parent = bus->bridge;
-
-	retval = device_add(&bus->dev);
-	if (retval)
-		return retval;
-
-	bus->is_added = 1;
-
-	/* Create legacy_io and legacy_mem files for this bus */
-	pci_create_legacy_files(bus);
+	int retval = -EBUSY;
+
+	if (pci_bus_get_state(bus) == PCI_BUS_STATE_INITIALIZED) {
+		if (bus->bridge)
+			bus->dev.parent = bus->bridge;
+		retval = device_add(&bus->dev);
+		if (retval == 0) {
+			/* Create legacy_io and legacy_mem files for this bus */
+			pci_create_legacy_files(bus);
+			pci_bus_change_state(bus, PCI_BUS_STATE_INITIALIZED,
+					PCI_BUS_STATE_WORKING, false);
+			bus->is_added = 1;
+		}
+	}
 
 	return retval;
 }
@@ -232,13 +233,14 @@ void pci_bus_add_devices(const struct pci_bus *bus)
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		BUG_ON(!dev->is_added);
 
-		child = dev->subordinate;
+		child = pci_lock_subordinate(dev, PCI_BUS_STATE_STOPPING - 1);
+		if (!child)
+			continue;
+
 		/*
 		 * If there is an unattached subordinate bus, attach
 		 * it and then scan for unattached PCI devices.
 		 */
-		if (!child)
-			continue;
 		if (list_empty(&child->node)) {
 			down_write(&pci_bus_sem);
 			list_add_tail(&child->node, &dev->bus->children);
@@ -250,28 +252,34 @@ void pci_bus_add_devices(const struct pci_bus *bus)
 		 * register the bus with sysfs as the parent is now
 		 * properly registered.
 		 */
-		if (child->is_added)
-			continue;
-		retval = pci_bus_add_child(child);
-		if (retval)
-			dev_err(&dev->dev, "Error adding bus, continuing\n");
+		if (pci_bus_get_state(child) == PCI_BUS_STATE_INITIALIZED) {
+			retval = pci_bus_add_child(child);
+			if (retval)
+				dev_err(&dev->dev,
+					"Error adding bus, continuing\n");
+		}
+
+		pci_bus_unlock(child);
 	}
 }
 
 void pci_enable_bridges(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
+	struct pci_bus *child;
 	int retval;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
-		if (dev->subordinate) {
+		child = pci_lock_subordinate(dev, PCI_BUS_STATE_STOPPING - 1);
+		if (child) {
 			if (!pci_is_enabled(dev)) {
 				retval = pci_enable_device(dev);
 				if (retval)
 					dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
 				pci_set_master(dev);
 			}
-			pci_enable_bridges(dev->subordinate);
+			pci_enable_bridges(child);
+			pci_bus_unlock(child);
 		}
 	}
 }
-- 
1.7.9.5


  parent reply	other threads:[~2012-08-07 16:10 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-07 16:10 [RFC PATCH v1 00/22] introduce PCI bus lock to serialize PCI hotplug operations Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 01/22] PCI: use pci_get_domain_bus_and_slot() to avoid race conditions Jiang Liu
2012-09-11 22:00   ` Bjorn Helgaas
2012-09-12  8:37     ` Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 02/22] PCI: trivial cleanups for drivers/pci/remove.c Jiang Liu
2012-09-11 22:03   ` Bjorn Helgaas
2012-09-12  8:50     ` Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 03/22] PCI: change PCI device management code to better follow device model Jiang Liu
2012-09-11 22:03   ` Bjorn Helgaas
2012-08-07 16:10 ` [RFC PATCH v1 04/22] PCI: split PCI bus device registration into two stages Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 05/22] PCI: introduce pci_bus_{get|put}() to manage PCI bus reference count Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 06/22] PCI: use a global lock to serialize PCI root bridge hotplug operations Jiang Liu
2012-09-11 22:57   ` Bjorn Helgaas
2012-09-12 15:42     ` Jiang Liu
2012-09-12 16:51       ` Bjorn Helgaas
2012-09-13 16:00         ` [PATCH 1/2] PCI: introduce root bridge hotplug safe interfaces to walk root buses Jiang Liu
2012-09-13 17:40           ` Bjorn Helgaas
2012-09-17 15:55             ` Jiang Liu
2012-09-17 16:24               ` Bjorn Helgaas
2012-09-18 21:39                 ` Bjorn Helgaas
2012-09-21 16:07                   ` [PATCH v4] PCI: introduce two interfaces to walk PCI buses Jiang Liu
2012-09-26 20:14                     ` Bjorn Helgaas
2012-09-13 16:00         ` [PATCH 2/2] PCI: remove host bridge hotplug unsafe interface pci_get_next_bus() Jiang Liu
2012-09-17 15:51         ` [RFC PATCH v1 06/22] PCI: use a global lock to serialize PCI root bridge hotplug operations Jiang Liu
2012-09-20 18:49         ` Paul E. McKenney
2012-08-07 16:10 ` [RFC PATCH v1 07/22] PCI: introduce PCI bus lock to serialize PCI " Jiang Liu
2012-09-11 23:24   ` Bjorn Helgaas
2012-08-07 16:10 ` [RFC PATCH v1 08/22] PCI: introduce hotplug safe search interfaces for PCI bus/device Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 09/22] PCI: enhance PCI probe logic to support PCI bus lock mechanism Jiang Liu
2012-08-07 16:10 ` Jiang Liu [this message]
2012-08-07 16:10 ` [RFC PATCH v1 11/22] PCI: enhance PCI resource assignment " Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 12/22] PCI: enhance PCI remove " Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 13/22] PCI: make each PCI device hold a reference to its parent PCI bus Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 14/22] PCI/sysfs: use PCI bus lock to avoid race conditions Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 15/22] PCI/eeepc: " Jiang Liu
2012-09-11 23:18   ` Bjorn Helgaas
2012-09-12 14:24     ` [PATCH] eeepc-laptop: fix device reference count leakage in eeepc_rfkill_hotplug() Jiang Liu
2012-09-12 19:59       ` Bjorn Helgaas
2012-08-07 16:10 ` [RFC PATCH v1 16/22] PCI/asus-wmi: use PCI bus lock to avoid race conditions Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 17/22] PCI/pciehp: " Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 18/22] PCI/acpiphp: " Jiang Liu
2012-08-07 16:10 ` [RFC PATCH v1 19/22] PCI/x86: enable PCI bus lock mechanism for x86 platforms Jiang Liu
2012-09-11 23:22   ` Bjorn Helgaas
2012-09-12  9:56     ` Jiang Liu
2012-08-07 16:11 ` [RFC PATCH v1 20/22] PCI/IA64: enable PCI bus lock mechanism for IA64 platforms Jiang Liu
2012-08-07 16:11 ` [RFC PATCH v1 21/22] PCI: cleanups for PCI bus lock implementation Jiang Liu
2012-09-11 23:21   ` Bjorn Helgaas
2012-09-12  8:58     ` Jiang Liu
2012-08-07 16:11 ` [RFC PATCH v1 22/22] PCI: unexport pci_root_buses Jiang Liu
2012-08-07 18:11 ` [RFC PATCH v1 00/22] introduce PCI bus lock to serialize PCI hotplug operations Don Dutile
2012-08-08 15:49   ` Jiang Liu

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