1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 122d056d96d5..8a230f0ef77c 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -13,6 +13,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>
+#include <linux/ioctl.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -644,6 +645,22 @@ static int wdm_release(struct inode *inode, struct file *file)
         return 0;
 }
 
+static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct wdm_device *desc = file->private_data;
+        int rv = 0;
+
+        switch (cmd) {
+        case IOCTL_WDM_MAX_COMMAND:
+                if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand)))
+                        rv = -EFAULT;
+                break;
+        default:
+                rv = -ENOTTY;
+        }
+        return rv;
+}
+
 static const struct file_operations wdm_fops = {
         .owner =        THIS_MODULE,
         .read =         wdm_read,
@@ -652,6 +669,8 @@ static const struct file_operations wdm_fops = {
         .flush =        wdm_flush,
         .release =      wdm_release,
         .poll =         wdm_poll,
+        .unlocked_ioctl = wdm_ioctl,
+        .compat_ioctl = wdm_ioctl,
         .llseek =       noop_llseek,
 };