rmmod while module is in use

[Davide Rossetti <davide.rossetti@roma1.infn.it>]

maybe RTFM...
a module:
- char device driver for..
- a PCI device

any clue as to how to protect from module unloading while there is still 
some process opening it??? have I to sleep in the remove_one() pci 
driver function till last process closes its file descriptor???

static void __devexit apedev_remove_one(struct pci_dev *pdev)
{
    ApeDev* apedev = pci_get_drvdata(pdev);

    if(test_bit(APEDEV_FLAG_OPEN, &apedev->flags)) {
        PERROR("still open flag on!!! (flags=0x%08x)\n", apedev->flags);

        // sleep here till it gets closed...

    }
    ...
}

static struct pci_driver apedev_driver = {
    .name     =  DEVNAME,
    .id_table =  apedev_pci_tbl,
    .probe    =  apedev_init_one,
    .remove   =  __devexit_p(apedev_remove_one),
};