linux-kernel - [PATCH 21/22] PCI: make pci_rescan_bus_bridge_resize use pci_scan

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Message-Id: <1328933185-15154-22-git-send-email-yinghai@kernel.org>
Date:	Fri, 10 Feb 2012 20:06:24 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 21/22] PCI: make pci_rescan_bus_bridge_resize use pci_scan_bridge instead

So after remove all children and then using setpci change bus register and rescan
bridge could use new set bus number.

Otherwise need to rescan parent bus, it would have too much overhead.

also need to use pci_bus_add_single_device to make sure new change bus have directory
 /sys/../.../pci_bus.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/probe.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b24fa1f..54aeae0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1972,14 +1972,16 @@ EXPORT_SYMBOL(pci_scan_bus);
  */
 unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
 {
-	unsigned int max;
-	struct pci_bus *bus = bridge->subordinate;
+	unsigned int max = 0;
+	int pass;
+	struct pci_bus *bus = bridge->bus;
 
-	max = pci_scan_child_bus(bus);
+	for (pass = 0; pass < 2; pass++)
+		max = pci_scan_bridge(bus, bridge, max, pass);
 
 	pci_assign_unassigned_bridge_resources(bridge);
 
-	pci_bus_add_devices(bus);
+	pci_bus_add_single_device(bridge);
 
 	return max;
 }
-- 
1.7.7

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