[PATCH] fix Kernel Panic in scsi_host_dev_release

If a driver calls scsi_register, but then has a problem in there
detect where they need to call scsi_unregister the parent pointer of
the struct device may never be set.

 drivers/scsi/hosts.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

drivers/scsi/hosts.c

@@ -158,7 +158,8 @@ static void scsi_host_dev_release(struct device *dev)
 	scsi_proc_hostdir_rm(shost->hostt);
 	scsi_destroy_command_freelist(shost);
 
-	put_device(parent);
+	if (parent)
+		put_device(parent);
 	kfree(shost);
 }