linux-kernel - [PATCH v2 35/37] PCI: Make /sys/bus/pci/rescan rescan root

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Date:	Fri,  9 Mar 2012 23:00:35 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	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,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v2 35/37] PCI: Make /sys/bus/pci/rescan rescan root

It will rediscover removed pci root buses.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/pci-sysfs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 4d122cb..fc0a7de 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -284,6 +284,7 @@ msi_bus_store(struct device *dev, struct device_attribute *attr,
 
 #ifdef CONFIG_HOTPLUG
 static DEFINE_MUTEX(pci_remove_rescan_mutex);
+void __weak arch_pci_root_rescan(void) { }
 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 				size_t count)
 {
@@ -295,6 +296,7 @@ static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
 
 	if (val) {
 		mutex_lock(&pci_remove_rescan_mutex);
+		arch_pci_root_rescan();
 		while ((b = pci_find_next_bus(b)) != NULL)
 			pci_rescan_bus(b);
 		mutex_unlock(&pci_remove_rescan_mutex);
-- 
1.7.7

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