From: Marcel Holtmann <marcel@holtmann.org>
To: arnd@arndb.de, gregkh@linuxfoundation.org,
johannes@sipsolutions.net, davem@davemloft.net
Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org,
netdev@vger.kernel.org
Subject: [PATCH] rfkill: allocate static minor
Date: Thu, 24 Oct 2019 19:40:42 +0200 [thread overview]
Message-ID: <20191024174042.19851-1-marcel@holtmann.org> (raw)
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>
---
include/linux/miscdevice.h | 1 +
net/rfkill/core.c | 9 +++++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 3247a3dc7934..b06b75776a32 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -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;
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index f9b08a6d8dbe..0bf9bf1ceb8f 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -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);
--
2.21.0
next reply other threads:[~2019-10-24 17:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 17:40 Marcel Holtmann [this message]
2019-10-24 18:44 ` [PATCH] rfkill: allocate static minor Greg KH
2019-10-24 20:23 ` Marcel Holtmann
2019-11-05 17:25 ` Greg KH
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