Bug#826629: Possible offb unload fix.

[Mathieu Malaterre <malat@debian.org>]

Hi Len,

Here is the release function I am using:

static void offb_destroy(struct fb_info *info)
{
        struct offb_par *par = (struct offb_par *) info->par;
        if (info->screen_base)
                iounmap(info->screen_base);
        if (par->cmap_adr != NULL) {
                iounmap(par->cmap_adr);
                par->cmap_adr = NULL;
        }
        release_mem_region(info->apertures->ranges[0].base,
info->apertures->ranges[0].size);
        framebuffer_release(info);
}


(you need the cast to avoid warning about deref of void*).

And if I do `modprobe radeonfb`:

[   72.163546] bus: 'pci': add driver radeonfb
[   72.163618] bus: 'pci': driver_probe_device: matched device
0000:00:10.0 with driver radeonfb
[   72.163627] bus: 'pci': really_probe: probing driver radeonfb with
device 0000:00:10.0
[   72.163651] devices_kset: Moving 0000:00:10.0 to end of list
[   72.163659] radeonfb_pci_register BEGIN
[   72.163680] radeonfb 0000:00:10.0: enabling device (0006 -> 0007)
[   72.163721] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem
0x98000000-0x9fffffff pref]
[   72.163726] radeonfb (0000:00:10.0): cannot request region 0.
[   72.163746] radeonfb: probe of 0000:00:10.0 failed with error -16