Quite a number of rc.d scripts try to load kernel modules. Many

of them do that conditionally depending on kldstat.  The code is
duplicated all over, but bugs can be uniqie.

To make the things more consistent, introduce a new rc.subr function,
load_kld, which takes care of loading a kernel module conditionally.

(Found this lying for a while in my p4 branch for various hacks.)

1 files changed, 39 insertions, 0 deletions

diff --git a/etc/rc.subr b/etc/rc.subr
index 1037bbc..2928d3b 100644
--- a/etc/rc.subr
+++ b/etc/rc.subr
@@ -1356,6 +1356,45 @@ mount_md()
 	/sbin/mdmfs $flags -s $1 md $2
 }
 
+# Code common to scripts that need to load a kernel module
+# if it isn't in the kernel yet. Syntax:
+#   load_kld [-e regexp] [-m modname] filename
+# where -e or -m chooses the way to check if the module
+# is already loaded:
+#   regexp is egrep'd in the output from `kldstat -v',
+#   modname is passed to `kldstat -m'.
+# The default way is as though `-m filename' were specified.
+load_kld()
+{
+	local _loaded _mod _opt _re
+
+	while getopts "e:m:" _opt; do
+		case "$_opt" in
+		e) _re="$OPTARG" ;;
+		m) _mod="$OPTARG" ;;
+		esac
+	done
+	shift $(($OPTIND - 1))
+	_mod=${_mod:-$1}
+	_loaded=false
+	if [ -n "$_re" ]; then
+		if kldstat -v | egrep -q -e "$_re"; then
+			_loaded=true
+		fi
+	else
+		if kldstat -q -m "$_mod"; then
+			_loaded=true
+		fi
+	fi
+	if ! $_loaded; then
+		if ! kldload "$1"; then
+			warn "Unable to load kernel module $1"
+			return 1
+		fi
+	fi
+	return 0
+}
+
 # ltr str src dst
 #	Change every $src in $str to $dst.
 #	Useful when /usr is not yet mounted and we cannot use tr(1), sed(1) nor