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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2017-05-10 17:19:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-18 17:59:06 +0300 |
| commit | f4660cc994e12bae60d6f49895636fba662ce0a1 (patch) | |
| tree | 1b2772f70601a954a790e19f75333dc993163ecd /drivers/vhost | |
| parent | ff35eb23de9be50fbe3405f35244b5e82eadc5fa (diff) | |
| download | linux-f4660cc994e12bae60d6f49895636fba662ce0a1.tar.xz | |
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')
| -rw-r--r-- | drivers/vhost/vsock.c | 4 |
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"); |