[PATCH 18/40] PCI: Rescan bus using callback method too

[Yinghai Lu]

Just like removal.

Because We could add new bus under the bridges...

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 drivers/pci/pci-sysfs.c |   28 +++++++++++++++++++---------
 1 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 02d107b..60e04b2 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -356,24 +356,34 @@ remove_store(struct device *dev, struct device_attribute *dummy,
 	return count;
 }
 
+static void bus_rescan_callback(struct device *dev)
+{
+	struct pci_bus *bus = to_pci_bus(dev);
+
+	mutex_lock(&pci_remove_rescan_mutex);
+	if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
+		pci_rescan_bus_bridge_resize(bus->self);
+	else
+		pci_rescan_bus(bus);
+	mutex_unlock(&pci_remove_rescan_mutex);
+}
+
 static ssize_t
 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 		 const char *buf, size_t count)
 {
+	int ret = 0;
 	unsigned long val;
-	struct pci_bus *bus = to_pci_bus(dev);
 
 	if (strict_strtoul(buf, 0, &val) < 0)
 		return -EINVAL;
 
-	if (val) {
-		mutex_lock(&pci_remove_rescan_mutex);
-		if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
-			pci_rescan_bus_bridge_resize(bus->self);
-		else
-			pci_rescan_bus(bus);
-		mutex_unlock(&pci_remove_rescan_mutex);
-	}
+	if (val)
+		ret = device_schedule_callback(dev, bus_rescan_callback);
+
+	if (ret)
+		count = ret;
+
 	return count;
 }
 
-- 
1.7.7

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