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authorEric W. Biederman <ebiederm@aristanetworks.com>2010-09-14 11:38:06 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:16:43 -0700
commit91960a46c658b719c03fba80f1c60a96393bbcfd (patch)
treeffa50ea8eeddd9105dff834877ed594cf71ce697 /drivers/uio/uio.c
parent6427a7655afd7f07dfa83736defd1d94656c83e5 (diff)
uio: Support 2^MINOR_BITS minors
register_chrdev limits uio devices to 256 minor numbers which causes problems on one system I have with 384+ uio devices. So instead set UIO_MAX_DEVICES to the maximum number of minors and use alloc_chrdev_region to reserve the uio minors. The final result is that the code works the same but the uio driver now supports any minor the idr allocator comes up with. Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/uio/uio.c')
-rw-r--r--drivers/uio/uio.c43
1 files changed, 37 insertions, 6 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 0fd2cda74244..3d4d65b0626f 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -23,9 +23,10 @@
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/kobject.h>
+#include <linux/cdev.h>
#include <linux/uio_driver.h>
-#define UIO_MAX_DEVICES 255
+#define UIO_MAX_DEVICES (1U << MINORBITS)
struct uio_device {
struct module *owner;
@@ -41,6 +42,7 @@ struct uio_device {
};
static int uio_major;
+static struct cdev *uio_cdev;
static DEFINE_IDR(uio_idr);
static const struct file_operations uio_fops;
@@ -731,15 +733,44 @@ static const struct file_operations uio_fops = {
static int uio_major_init(void)
{
- uio_major = register_chrdev(0, "uio", &uio_fops);
- if (uio_major < 0)
- return uio_major;
- return 0;
+ static const char name[] = "uio";
+ struct cdev *cdev = NULL;
+ dev_t uio_dev = 0;
+ int result;
+
+ result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name);
+ if (result)
+ goto out;
+
+ result = -ENOMEM;
+ cdev = cdev_alloc();
+ if (!cdev)
+ goto out_unregister;
+
+ cdev->owner = THIS_MODULE;
+ cdev->ops = &uio_fops;
+ kobject_set_name(&cdev->kobj, "%s", name);
+
+ result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES);
+ if (result)
+ goto out_put;
+
+ uio_major = MAJOR(uio_dev);
+ uio_cdev = cdev;
+ result = 0;
+out:
+ return result;
+out_put:
+ kobject_put(&cdev->kobj);
+out_unregister:
+ unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES);
+ goto out;
}
static void uio_major_cleanup(void)
{
- unregister_chrdev(uio_major, "uio");
+ unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES);
+ cdev_del(uio_cdev);
}
static int init_uio_class(void)