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authorStefan Hajnoczi <stefanha@redhat.com>2017-05-10 10:19:18 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-18 16:59:06 +0200
commitf4660cc994e12bae60d6f49895636fba662ce0a1 (patch)
tree1b2772f70601a954a790e19f75333dc993163ecd /include/linux/miscdevice.h
parentff35eb23de9be50fbe3405f35244b5e82eadc5fa (diff)
downloadlwn-f4660cc994e12bae60d6f49895636fba662ce0a1.tar.gz
lwn-f4660cc994e12bae60d6f49895636fba662ce0a1.zip
vhost/vsock: use static minor number
Vhost-vsock is a software device so there is no probe call that causes the driver to register its misc char device node. This creates a chicken and egg problem: userspace applications must open /dev/vhost-vsock to use the driver but the file doesn't exist until the kernel module has been loaded. Use the devname modalias mechanism so that /dev/vhost-vsock is created at boot. The vhost_vsock kernel module is automatically loaded when the first application opens /dev/host-vsock. Note that the "reserved for local use" range in Documentation/admin-guide/devices.txt is incorrect. The userio driver already occupies part of that range. I've updated the documentation accordingly. Cc: device@lanana.org Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/miscdevice.h')
-rw-r--r--include/linux/miscdevice.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 762b5fec3383..58751eae5f77 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -54,6 +54,7 @@
#define VHOST_NET_MINOR 238
#define UHID_MINOR 239
#define USERIO_MINOR 240
+#define VHOST_VSOCK_MINOR 241
#define MISC_DYNAMIC_MINOR 255
struct device;