1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 56ac2bc003c7..37897a8c95e0 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -43,6 +43,7 @@ pci_config_attr(subsystem_vendor, "0x%04x\n");
 pci_config_attr(subsystem_device, "0x%04x\n");
 pci_config_attr(class, "0x%06x\n");
 pci_config_attr(irq, "%u\n");
+pci_config_attr(is_enabled, "%u\n");
 
 static ssize_t local_cpus_show(struct device *dev,
                         struct device_attribute *attr, char *buf)
@@ -90,6 +91,25 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
                        (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
                        (u8)(pci_dev->class));
 }
+static ssize_t
+is_enabled_store(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+
+        /* this can crash the machine when done on the "wrong" device */
+        if (!capable(CAP_SYS_ADMIN))
+                return count;
+
+        if (*buf == '0')
+                pci_disable_device(pdev);
+
+        if (*buf == '1')
+                pci_enable_device(pdev);
+
+        return count;
+}
+
 
 struct device_attribute pci_dev_attrs[] = {
         __ATTR_RO(resource),
@@ -101,6 +121,7 @@ struct device_attribute pci_dev_attrs[] = {
         __ATTR_RO(irq),
         __ATTR_RO(local_cpus),
         __ATTR_RO(modalias),
+        __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
         __ATTR_NULL,
 };