# Re: WARNING in dma\_map\_page\_attrs

- From: hch@lst.de \<hch@lst.de\>
- Date: 2020-10-27 08:11:11 
- List: netdev
- Page: https://ratatoskr.run/netdev/2020/10/6150997
- Thread: https://ratatoskr.run/linux-media/2020/10/6146094/t.md

```text
On Mon, Oct 26, 2020 at 05:23:48AM +0000, Parav Pandit wrote:
> Hi Christoph,
> 
> > From: Jakub Kicinski <kuba@kernel.org>
> > Sent: Saturday, October 24, 2020 11:45 PM
> > 
> > CC: rdma, looks like rdma from the stack trace
> > 
> > On Fri, 23 Oct 2020 20:07:17 -0700 syzbot wrote:
> > > syzbot has found a reproducer for the following issue on:
> > >
> > > HEAD commit:    3cb12d27 Merge tag 'net-5.10-rc1' of git://git.kernel.org/..
> 
> In [1] you mentioned that dma_mask should not be set for dma_virt_ops.
> So patch [2] removed it.
>
> But check to validate the dma mask for all dma_ops was added in [3].
> 
> What is the right way? Did I misunderstood your comment about dma_mask in [1]?

No, I did not say we don't need the mask.  I said copying over the
various dma-related fields from the parent is bogus.

I think rxe (and ther other drivers/infiniband/sw drivers) need a simple
dma_coerce_mask_and_coherent and nothing else.
```