2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 08fe68d34f32..05ad2a8f286c 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -1220,6 +1220,15 @@ static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffe
         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
 }
 
+static int ioctl_get_speed(struct client *client, void *buffer)
+{
+        struct fw_cdev_get_speed *request = buffer;
+
+        request->max_speed = client->device->max_speed;
+
+        return 0;
+}
+
 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
         ioctl_get_info,
         ioctl_send_request,
@@ -1238,6 +1247,7 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
         ioctl_deallocate_iso_resource,
         ioctl_allocate_iso_resource_once,
         ioctl_deallocate_iso_resource_once,
+        ioctl_get_speed,
 };
 
 static int dispatch_ioctl(struct client *client,
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 08ca838a727b..f819c1026958 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -229,6 +229,7 @@ union fw_cdev_event {
 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE      _IOW('#', 0x0e, struct fw_cdev_deallocate)
 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE   _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
+#define FW_CDEV_IOC_GET_SPEED                    _IOR('#', 0x11, struct fw_cdev_get_speed)
 
 /* FW_CDEV_VERSION History
  *
@@ -575,4 +576,13 @@ struct fw_cdev_allocate_iso_resource {
         __u32 handle;
 };
 
+/**
+ * struct fw_cdev_get_speed - Query maximum speed to or from this device
+ * @max_speed:  Speed code; minimum of the device's link speed, the local node's
+ *              link speed, and all PHY port speeds between the two links
+ */
+struct fw_cdev_get_speed {
+        __u32 max_speed;
+};
+
 #endif /* _LINUX_FIREWIRE_CDEV_H */