linux-kernel - [PATCH 5.4 83/92] rfkill: allocate static minor

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Message-Id: <20191211150300.973343815@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:06:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 83/92] rfkill: allocate static minor

From: Marcel Holtmann <marcel@...tmann.org>

commit 8670b2b8b029a6650d133486be9d2ace146fd29a upstream.

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@...tmann.org>
Link: https://lore.kernel.org/r/20191024174042.19851-1-marcel@holtmann.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>

---
 include/linux/miscdevice.h |    1 +
 net/rfkill/core.c          |    9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

--- 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;
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1316,10 +1316,12 @@ static const struct file_operations rfki
 	.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);