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Subject[PATCH 26/64] Driver Core: misc: add nodename support for misc devices.
Date
From: Kay Sievers <kay.sievers@vrfy.org>

This adds support for misc devices to report their requested nodename to
userspace. It also updates a number of misc drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/microcode_core.c | 1 +
drivers/char/hw_random/core.c | 1 +
drivers/char/misc.c | 15 ++++++++++++---
drivers/md/dm-ioctl.c | 1 +
drivers/net/tun.c | 1 +
include/linux/miscdevice.h | 1 +
6 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 9c44615..9371448 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -236,6 +236,7 @@ static const struct file_operations microcode_fops = {
static struct miscdevice microcode_dev = {
.minor = MICROCODE_MINOR,
.name = "microcode",
+ .devnode = "cpu/microcode",
.fops = &microcode_fops,
};

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index e5d583c..fc93e2f 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -153,6 +153,7 @@ static const struct file_operations rng_chrdev_ops = {
static struct miscdevice rng_miscdev = {
.minor = RNG_MISCDEV_MINOR,
.name = RNG_MODULE_NAME,
+ .devnode = "hwrng",
.fops = &rng_chrdev_ops,
};

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index a5e0db9..62c99fa 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -168,7 +168,6 @@ static const struct file_operations misc_fops = {
.open = misc_open,
};

-
/**
* misc_register - register a miscellaneous device
* @misc: device structure
@@ -217,8 +216,8 @@ int misc_register(struct miscdevice * misc)
misc_minors[misc->minor >> 3] |= 1 << (misc->minor & 7);
dev = MKDEV(MISC_MAJOR, misc->minor);

- misc->this_device = device_create(misc_class, misc->parent, dev, NULL,
- "%s", misc->name);
+ misc->this_device = device_create(misc_class, misc->parent, dev,
+ misc, "%s", misc->name);
if (IS_ERR(misc->this_device)) {
err = PTR_ERR(misc->this_device);
goto out;
@@ -264,6 +263,15 @@ int misc_deregister(struct miscdevice *misc)
EXPORT_SYMBOL(misc_register);
EXPORT_SYMBOL(misc_deregister);

+static char *misc_nodename(struct device *dev)
+{
+ struct miscdevice *c = dev_get_drvdata(dev);
+
+ if (c->devnode)
+ return kstrdup(c->devnode, GFP_KERNEL);
+ return NULL;
+}
+
static int __init misc_init(void)
{
int err;
@@ -279,6 +287,7 @@ static int __init misc_init(void)
err = -EIO;
if (register_chrdev(MISC_MAJOR,"misc",&misc_fops))
goto fail_printk;
+ misc_class->nodename = misc_nodename;
return 0;

fail_printk:
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 823ceba..1128d3f 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1513,6 +1513,7 @@ static const struct file_operations _ctl_fops = {
static struct miscdevice _dm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DM_NAME,
+ .devnode = "mapper/control",
.fops = &_ctl_fops
};

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 811d351..11a0ba4 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1366,6 +1366,7 @@ static const struct file_operations tun_fops = {
static struct miscdevice tun_miscdev = {
.minor = TUN_MINOR,
.name = "tun",
+ .devnode = "net/tun",
.fops = &tun_fops,
};

diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index beb6ec9..0521177 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -41,6 +41,7 @@ struct miscdevice {
struct list_head list;
struct device *parent;
struct device *this_device;
+ const char *devnode;
};

extern int misc_register(struct miscdevice * misc);
--
1.6.3.2


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