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rfkill: allocate static minor 

udev has a feature of creating /dev/<node> device-nodes if it finds
a devnode:<node> modalias. This allows for auto-loading of modules that
provide the node. This requires to use a statically allocated minor
number for misc character devices.

However, rfkill uses dynamic minor numbers and prevents auto-loading
of the module. So allocate the next static misc minor number and use
it for rfkill.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Link: https://lore.kernel.org/r/20191024174042.19851-1-marcel@holtmann.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marcel Holtmann 2019-10-24 19:40:42 +02:00 committed by Greg Kroah-Hartman
parent 82b29b9f72
commit 8670b2b8b0
2 changed files with 8 additions and 2 deletions
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1
include/linux/miscdevice.h
View File

@ -57,6 +57,7 @@
#define UHID_MINOR 239
#define USERIO_MINOR 240
#define VHOST_VSOCK_MINOR 241
#define RFKILL_MINOR 242
#define MISC_DYNAMIC_MINOR 255
struct device;

9
net/rfkill/core.c
View File

@ -1316,10 +1316,12 @@ static const struct file_operations rfkill_fops = {
.llseek = no_llseek,
};
#define RFKILL_NAME "rfkill"
static struct miscdevice rfkill_miscdev = {
.name = "rfkill",
.fops = &rfkill_fops,
.minor = MISC_DYNAMIC_MINOR,
.name = RFKILL_NAME,
.minor = RFKILL_MINOR,
};
static int __init rfkill_init(void)
@ -1371,3 +1373,6 @@ static void __exit rfkill_exit(void)
class_unregister(&rfkill_class);
}
module_exit(rfkill_exit);
MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
MODULE_ALIAS("devname:" RFKILL_NAME);