package/busybox: support automatic module loading with mdev

A recently discussed on the mailing list:
http://lists.busybox.net/pipermail/buildroot/2016-February/154189.html

Our mdev configuration currently doesn't handle module loading. Fix that by:

- Telling mdev to run modprobe on hotplug events providing MODALIAS

- Adjust the init script to handle coldplug modalias events (E.G. modules
  for which the devices were already present before mdev was added as the
  hotplug handler). mdev -s should arguable handle this, but it doesn't.

Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/package/busybox/S10mdev b/package/busybox/S10mdev
index d386d420b54faa92ff5088cd991a883b0fc657e1..4cb31de42d03ae0e110dc2bdd3eb23b596bc8ec1 100644 (file)
--- a/package/busybox/S10mdev
+++ b/package/busybox/S10mdev
@@ -8,6 +8,8 @@ case "$1" in
        echo "Starting mdev..."
        echo /sbin/mdev >/proc/sys/kernel/hotplug
        /sbin/mdev -s
+       # coldplug modules
+       find /sys/ -name modalias | xargs sort -u | xargs modprobe -abq
        ;;
   stop)
        ;;

diff --git a/package/busybox/mdev.conf b/package/busybox/mdev.conf
index 247c0ed02d2eb047836ba57d0fd585cbe9796cd8..4fafe63f0cc07abcefe9b58c65e5e933654809e6 100644 (file)
--- a/package/busybox/mdev.conf
+++ b/package/busybox/mdev.conf
@@ -33,3 +33,6 @@ event[0-9]+   root:root 640 =input/
 mice           root:root 640 =input/
 mouse[0-9]     root:root 640 =input/
 ts[0-9]                root:root 600 =input/
+
+# load modules
+$MODALIAS=.*   root:root 660 @modprobe "$MODALIAS"