# Re: remove NULL struct device support in the DMA API

- From: Christoph Hellwig \<hch@lst.de\>
- Date: 2019-04-03 15:36:08 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2019/04/5559573
- Thread: https://ratatoskr.run/linux-fbdev/2019/03/5545246/t.md

```text
Any comments on the remaining patches?  I'd like to give this series
a couple weeks of soaking in linux-next before the end of the merge
window, so reviews would be apprciated.

On Thu, Mar 21, 2019 at 03:52:28PM -0700, Christoph Hellwig wrote:
> We still have a few drivers which pass a NULL struct device pointer
> to DMA API functions, which generally is a bad idea as the API
> implementations rely on the device not only for ops selection, but
> also the dma mask and various other attributes, and many implementations
> have been broken for NULL device support for a while.
> 
> This series removes the few remaning users that weren't picked up in
> the last merge window and then removes core support for this "feature".
> 
> A git tree is also available at:
> 
>     git://git.infradead.org/users/hch/misc.git dma-remove-NULL-dev-support
> 
> Gitweb:
> 
>     http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-remove-NULL-dev-support
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---end quoted text---
```