50a480946b
We cannot install different opaque pointer for read and write of the same i/o address. - handle zero address in bmdma_writeb_common and install the same opaque pointer for both read and write access. Signed-off-by: Igor V. Kovalenko <igor.v.kovalenko@gmail.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>