1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 4e0acefb7565..faa4ab554d68 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -499,6 +499,45 @@ static struct device_attribute sriov_numvfs_attr =
                        sriov_numvfs_show, sriov_numvfs_store);
 #endif /* CONFIG_PCI_IOV */
 
+static ssize_t driver_override_store(struct device *dev,
+                                     struct device_attribute *attr,
+                                     const char *buf, size_t count)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        char *driver_override, *old = pdev->driver_override, *cp;
+
+        if (count > PATH_MAX)
+                return -EINVAL;
+
+        driver_override = kstrndup(buf, count, GFP_KERNEL);
+        if (!driver_override)
+                return -ENOMEM;
+
+        cp = strchr(driver_override, '\n');
+        if (cp)
+                *cp = '\0';
+
+        if (strlen(driver_override)) {
+                pdev->driver_override = driver_override;
+        } else {
+                kfree(driver_override);
+                pdev->driver_override = NULL;
+        }
+
+        kfree(old);
+
+        return count;
+}
+
+static ssize_t driver_override_show(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+
+        return sprintf(buf, "%s\n", pdev->driver_override);
+}
+static DEVICE_ATTR_RW(driver_override);
+
 static struct attribute *pci_dev_attrs[] = {
         &dev_attr_resource.attr,
         &dev_attr_vendor.attr,
@@ -521,6 +560,7 @@ static struct attribute *pci_dev_attrs[] = {
 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
         &dev_attr_d3cold_allowed.attr,
 #endif
+        &dev_attr_driver_override.attr,
         NULL,
 };