firewire: core: feed /dev/random with devices' GUIDs

Send the GUIDs of newly registered controllers and devices
to the /dev/random driver to help seed its pools.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 7a05fd24d68b..3873d535b28d 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -32,6 +32,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/random.h>
 #include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -1066,6 +1067,8 @@ static void fw_device_init(struct work_struct *work)
                 device->config_rom_retries = 0;
 
                 set_broadcast_channel(device, device->generation);
+
+                add_device_randomness(&device->config_rom[3], 8);
         }
 
         /*