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    SubjectRe: Linux 2.6.26-rc4


    On Mon, 26 May 2008, Jesper Krogh wrote:
    >
    > I did get this one (which I didn't on 2.6.25.2)
    >
    > [42949399.810959] ck804xrom ck804xrom_init_one(): Unable to register resource
    > 0x0000000000000000-0x00000000ffffffff - kernel bug?

    Something is trying to register a 4GB resource. That sounds unlikely
    (possible on a 64-bit PCI setup, but I think it's more likely to be some
    overflow of 0 in "unsigned int").

    In fact, this seems to be due to some driver bug. It looks like we have

    window->size = 0xffffffffUL - window->phys + 1UL;

    and in order for window->size to be 0x100000000, that means that
    window->phys has to be 0. Which looks impossible, or at least like
    ent->driver_data is neither DEV_CK804 nor DEV_MCP55. Very odd.

    The warning:

    > [42949399.979924] WARNING: at arch/x86/mm/ioremap.c:159 __ioremap_caller+0x299/0x330()

    is then just a result of the driver blindly continuing and trying to
    "ioremap()" the resource even though it's bogus and the resource
    allocation failed.

    In other words, that driver init routine is really bad about error
    handling. Carl-Daniel? David?

    Linus


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