MV88E6XXX_N_FID
*fid = find_first_zero_bit(chip->fid_bitmap, MV88E6XXX_N_FID);
DECLARE_BITMAP(fid_bitmap, MV88E6XXX_N_FID);
fid = find_next_bit(chip->fid_bitmap, MV88E6XXX_N_FID, fid + 1);
if (fid == MV88E6XXX_N_FID)
bitmap_zero(chip->fid_bitmap, MV88E6XXX_N_FID);