I have a driver for a PCI device implemented in an LKM. I can load and
unload the module, and the driver seems to function properly until I
attempt to unload/load it for the fourth time. When I do this, the second
call to pci_mapreg_map() seems to fail in such a way that it never
returns,
and I have to reset the CPU to clear the problem. Here's the code snippet
that runs as part of the attach function:

if ( pci_mapreg_map(pa, PDX_PCI_BAR0, PCI_MAPREG_MEM_TYPE_32BIT,
         0, &sc->pcit, &sc->pcih, &sc->pciaddress, &sc->pcisize) != 0 )
{
    PDXLOG(LOG_CRIT,
        "%s: unable to map internal pci space\n",
         sc->device.dv_xname);
    return;
}

if ( pci_mapreg_map(pa, PDX_PCI_BAR1, PCI_MAPREG_MEM_TYPE_32BIT,
         0, &sc->memt, &sc->memh, &sc->memaddress, &sc->memsize) != 0 )
{
    PDXLOG(LOG_INFO,
        "%s: error mapping device register space\n",
        sc->device.dv_xname);
    return;
}

And here's the code that runs when I detach:

if ( sc->memsize )
{
    bus_space_unmap(sc->memt, sc->memh, sc->memsize);
}
if ( sc->pcisize )
{
    bus_space_unmap(sc->pcit, sc->pcih, sc->pcisize);
}

I'm hoping that someone can point me in the right direction here. Am I
missing something obvious?

Thanks,
Ken



       
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