HID: uhid: allocate static minor
udev has this nice feature of creating "dead" /dev/<node> device-nodes if
it finds a devnode:<node> modalias. Once the node is accessed, the kernel
automatically loads the module that provides the node. However, this
requires udev to know the major:minor code to use for the node. This
feature was introduced by:
commit 578454ff7e
Author: Kay Sievers <kay.sievers@vrfy.org>
Date: Thu May 20 18:07:20 2010 +0200
driver core: add devname module aliases to allow module on-demand auto-loading
However, uhid uses dynamic minor numbers so this doesn't actually work. We
need to load uhid to know which minor it's going to use.
Hence, allocate a static minor (just like uinput does) and we're good
to go.
Reported-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
parent
84fca9f38c
commit
19872d20c8
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@ -615,7 +615,7 @@ static const struct file_operations uhid_fops = {
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static struct miscdevice uhid_misc = {
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.fops = &uhid_fops,
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.minor = MISC_DYNAMIC_MINOR,
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.minor = UHID_MINOR,
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.name = UHID_NAME,
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};
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@ -634,4 +634,5 @@ module_exit(uhid_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
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MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem");
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MODULE_ALIAS_MISCDEV(UHID_MINOR);
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MODULE_ALIAS("devname:" UHID_NAME);
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@ -45,6 +45,7 @@
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#define MAPPER_CTRL_MINOR 236
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#define LOOP_CTRL_MINOR 237
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#define VHOST_NET_MINOR 238
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#define UHID_MINOR 239
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#define MISC_DYNAMIC_MINOR 255
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struct device;
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