[src/trunk]: src/sys/dev dev_verbose(9): Prohibit autounloading modules.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5cfa34c2dfe1
branches:  trunk
changeset: 1021502:5cfa34c2dfe1
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Jun 01 22:58:03 2021 +0000

description:
dev_verbose(9): Prohibit autounloading modules.

This logic is not safe for autounload right now -- there's no
mechanism by which to block new users and wait for existing users to
drain when unloading.  To be remedied!

diffstat:

 sys/dev/dev_verbose.h |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (18 lines):

diff -r 3d053fba87c5 -r 5cfa34c2dfe1 sys/dev/dev_verbose.h
--- a/sys/dev/dev_verbose.h     Tue Jun 01 21:29:24 2021 +0000
+++ b/sys/dev/dev_verbose.h     Tue Jun 01 22:58:03 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dev_verbose.h,v 1.4 2020/08/11 12:10:10 uwe Exp $ */
+/*     $NetBSD: dev_verbose.h,v 1.5 2021/06/01 22:58:03 riastradh Exp $ */
 
 /*
  * Redistribution and use in source and binary forms, with or without
@@ -75,6 +75,8 @@
                tag ## _findproduct = saved_findproduct;                \
                tag ## verbose_loaded = 0;                              \
                return 0;                                               \
+       case MODULE_CMD_AUTOUNLOAD:                                     \
+               return EBUSY;                                           \
        default:                                                        \
                return ENOTTY;                                          \
        }                                                               \