Comment # 5 on bug 989713 from Michal Suchanek

It works for me on kernel 4.15 so long as sdhci-iproc is not loaded in
initramfs. This should work with kernel 4.14 / Leap 42.3 as well.

Can the driver be fixed to handle this case?

# cat /etc/dracut.conf.d/raspberrypi_modules.conf
add_drivers+=" bcm2835-sdhost bcm2835_dma mmc_block "
# Workaround for Wifi
omit_drivers+=" sdhci-iproc"