Hi,
On Fri, Nov 6, 2009 at 7:35 AM, Mena Soliko <solikoman@xxxxxxxxx> wrote:
> Hi,
> I use char device with dynamic allocation of major number, when loading the
> driver to memory I get the major number 250, when removing the driver and
> reloading the same driver I get a new number: 249... (and so on)
> when I look at /proc/devices I see the my driver with the 250 and 249.
> My question is am I not removing the driver properly?
> code:
> int init_module(void) {
> retval = alloc_chrdev_region(&devt, 0, 1, DEVICE_NAME);
> pdata->cdev.owner = THIS_MODULE;
> cdev_init(&pdata->cdev, &fops);
> retval = cdev_add(&pdata->cdev, devt, 1);
> }
> void cleanup_module(void) {
> cdev_del(&pdata->cdev);
> unregister_chrdev_region(MAJOR(devt), 1);
You should call it like that: ([1])
unregister_chrdev_region(devt, 1);
> }
>
thanks,
Daniel.
[1]http://lxr.linux.no/#linux+v2.6.31/fs/char_dev.c#L306
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