Re: [PATCH] net: don't use kvzalloc for DMA memory

From: Mikulas Patocka
Date: Wed Apr 18 2018 - 13:54:06 EST

On Wed, 18 Apr 2018, David Miller wrote:

> From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
> Date: Wed, 18 Apr 2018 12:44:25 -0400 (EDT)
> > The structure net_device is followed by arbitrary driver-specific data
> > (accessible with the function netdev_priv). And for virtio-net, these
> > driver-specific data must be in DMA memory.
> And we are saying that this assumption is wrong and needs to be
> corrected.

So, try to find all the networking drivers that to DMA to the private

The problem here is that kvzalloc usually returns DMA-able area, but it
may return non-DMA area rarely, if the memory is too fragmented. So, we
are in a situation, where some networking drivers will randomly fail. Go
and find them.