• Ralf Baechle's avatar
    PCI legacy resource fix · fb0f2b40
    Ralf Baechle authored
    Since commit 368c73d4 the kernel will try
    to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if
    pci_assign_unassigned_resources() is used to do full resource assignment of
    the bus.  This fails because in the PIIX4 these BAR registers have
    implicitly assumed values and read back as zero; it used to work because
    the kernel used to just write zero to that register the read back value did
    match what was written.
    
    The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a resource
    as non-movable.  This will also be useful to keep other import system
    resources from being moved around - for example system consoles on PCI
    busses.
    
    [akpm@osdl.org: cleanup]
    Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    Acked-by: default avatarAlan Cox <alan@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    fb0f2b40
probe.c 32.2 KB