Fix a panic unloading the bktr driver when devfs is in use.

PR:	kern/36413

1 files changed, 2 insertions, 10 deletions

diff --git a/sys/dev/bktr/bktr_os.c b/sys/dev/bktr/bktr_os.c
index e26dc33..4aae13c 100644
--- a/sys/dev/bktr/bktr_os.c
+++ b/sys/dev/bktr/bktr_os.c
@@ -494,20 +494,12 @@ bktr_detach( device_t dev )
 	/* The memory is retained by the bktr_mem module so we can unload and */
 	/* then reload the main bktr driver module */
 
-	/* Unregister the /dev/bktrN, tunerN and vbiN devices */
+	/* Unregister the /dev/bktrN, tunerN and vbiN devices,
+	 * the aliases for unit 0 are automatically destroyed */
 	destroy_dev(bktr->vbidev);
 	destroy_dev(bktr->tunerdev);
 	destroy_dev(bktr->bktrdev);
 
-	/* If this is unit 0, then destroy the alias entries too */
-#if (__FreeBSD_version >=500000)
-	if (unit == 0) {
-	    destroy_dev(bktr->vbidev_alias);
-	    destroy_dev(bktr->tunerdev_alias);
-	    destroy_dev(bktr->bktrdev_alias);
-	}
-#endif
-
 	/*
 	 * Deallocate resources.
 	 */