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SubjectRe: [PATCH] Driver Core patches for 2.6.7
Date
From
ChangeSet 1.1722.89.46, 2004/06/03 09:48:45-07:00, greg@kroah.com

Add basic sysfs support for raw devices

This is needed by people who use udev and want raw devices.
SuSE is shipping with this patch.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


drivers/char/raw.c | 25 ++++++++++++++++++++++++-
1 files changed, 24 insertions(+), 1 deletion(-)

diff -Nru a/drivers/char/raw.c b/drivers/char/raw.c
--- a/drivers/char/raw.c Tue Jun 22 09:49:10 2004
+++ b/drivers/char/raw.c Tue Jun 22 09:49:10 2004
@@ -18,6 +18,7 @@
#include <linux/capability.h>
#include <linux/uio.h>
#include <linux/cdev.h>
+#include <linux/device.h>

#include <asm/uaccess.h>

@@ -26,6 +27,7 @@
int inuse;
};

+static struct class_simple *raw_class;
static struct raw_device_data raw_devices[MAX_RAW_MINORS];
static DECLARE_MUTEX(raw_mutex);
static struct file_operations raw_ctl_fops; /* forward declaration */
@@ -123,6 +125,13 @@
return ioctl_by_bdev(bdev, command, arg);
}

+static void bind_device(struct raw_config_request rq)
+{
+ class_simple_device_remove(MKDEV(RAW_MAJOR, rq.raw_minor));
+ class_simple_device_add(raw_class, MKDEV(RAW_MAJOR, rq.raw_minor),
+ NULL, "raw%d", rq.raw_minor);
+}
+
/*
* Deal with ioctls against the raw-device control interface, to bind
* and unbind other raw devices.
@@ -191,12 +200,15 @@
if (rq.block_major == 0 && rq.block_minor == 0) {
/* unbind */
rawdev->binding = NULL;
+ class_simple_device_remove(MKDEV(RAW_MAJOR, rq.raw_minor));
} else {
rawdev->binding = bdget(dev);
if (rawdev->binding == NULL)
err = -ENOMEM;
- else
+ else {
__module_get(THIS_MODULE);
+ bind_device(rq);
+ }
}
up(&raw_mutex);
} else {
@@ -287,6 +299,15 @@
goto error;
}

+ raw_class = class_simple_create(THIS_MODULE, "raw");
+ if (IS_ERR(raw_class)) {
+ printk(KERN_ERR "Error creating raw class.\n");
+ cdev_del(&raw_cdev);
+ unregister_chrdev_region(dev, MAX_RAW_MINORS);
+ goto error;
+ }
+ class_simple_device_add(raw_class, MKDEV(RAW_MAJOR, 0), NULL, "rawctl");
+
devfs_mk_cdev(MKDEV(RAW_MAJOR, 0),
S_IFCHR | S_IRUGO | S_IWUGO,
"raw/rawctl");
@@ -309,6 +330,8 @@
devfs_remove("raw/raw%d", i);
devfs_remove("raw/rawctl");
devfs_remove("raw");
+ class_simple_device_remove(MKDEV(RAW_MAJOR, 0));
+ class_simple_destroy(raw_class);
cdev_del(&raw_cdev);
unregister_chrdev_region(MKDEV(RAW_MAJOR, 0), MAX_RAW_MINORS);
}
-
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