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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 /drivers/vhost/vsock.c
parentff35eb23de9be50fbe3405f35244b5e82eadc5fa (diff)
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 'drivers/vhost/vsock.c')
-rw-r--r--drivers/vhost/vsock.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 3acef3c5d8ed..3f63e03de8e8 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -706,7 +706,7 @@ static const struct file_operations vhost_vsock_fops = {
};
static struct miscdevice vhost_vsock_misc = {
- .minor = MISC_DYNAMIC_MINOR,
+ .minor = VHOST_VSOCK_MINOR,
.name = "vhost-vsock",
.fops = &vhost_vsock_fops,
};
@@ -778,3 +778,5 @@ module_exit(vhost_vsock_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Asias He");
MODULE_DESCRIPTION("vhost transport for vsock ");
+MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR);
+MODULE_ALIAS("devname:vhost-vsock");

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