From: Ard Biesheuvel <ard.biesheu...@linaro.org> Date: Wed, 11 May 2016 09:47:49 +0200
> The current logic around the 'use_dac' module parameter prevents the > r81969 driver from being loadable on 64-bit systems without any RAM > below 4 GB when the parameter is left at its default value. > So introduce a new default value -1 which indicates that 64-bit DMA > should be enabled implicitly, but only if setting a 32-bit DMA mask > has failed earlier. This should prevent any regressions like the ones > caused by previous attempts to change this code. > > Cc: Realtek linux nic maintainers <nic_s...@realtek.com> > Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> I think we should just seriously consider changing the default, it's a really outdated reasoning behind the current default setting. Maybe relevant a decade ago, but probably not now. And if the card is completely disfunctional in said configuration, the default is definitely wrong.
