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authorAlex Chiang <achiang@hp.com>2009-03-20 14:56:41 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-03-20 14:59:07 -0700
commit738a6396c223b486304dda778119dbbca563f019 (patch)
treeee5f2801ed439d9d969598621de7d2b3ba8f8d0a /drivers/pci
parent77c27c7b49d69d45ccb94e481653f024f1ac6650 (diff)
PCI: Introduce /sys/bus/pci/devices/.../rescan
This interface allows the user to force a rescan of the device's parent bus and all subordinate buses, and rediscover devices removed earlier from this part of the device tree. Cc: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci-sysfs.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index e16990ecc024..e9a8706a6401 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -244,6 +244,24 @@ struct bus_attribute pci_bus_attrs[] = {
__ATTR_NULL
};
+static ssize_t
+dev_rescan_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ if (strict_strtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val) {
+ mutex_lock(&pci_remove_rescan_mutex);
+ pci_rescan_bus(pdev->bus);
+ mutex_unlock(&pci_remove_rescan_mutex);
+ }
+ return count;
+}
+
static void remove_callback(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@@ -298,6 +316,7 @@ struct device_attribute pci_dev_attrs[] = {
__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
#ifdef CONFIG_HOTPLUG
__ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
+ __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
#endif
__ATTR_NULL,
};