# Re: \[RFC, kernel\] powerpc/ioda: Set "read" permission when "write" is set

- From: Michael Ellerman \<mpe@ellerman.id.au\>
- Date: 2016-02-16 03:18:25 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/02/9488118
- Thread: https://ratatoskr.run/linuxppc-dev/2016/01/9487572/t.md

```text
On Tue, 2016-12-01 at 04:40:20 UTC, Alexey Kardashevskiy wrote:
> Quite often drivers set only "write" permission assuming that this
> includes "read" permission as well and this works on plenty platforms.
> However IODA2 is strict about this and produces an EEH when "read"
> permission is not and reading happens.
> 
> This adds a workaround in IODA code to always add the "read" bit when
> the "write" bit is set.
> 
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Alexey Kardashevskiy <redacted>
> Tested-by: Douglas Miller <redacted>

Are you planning on sending a non-RFC version of this?

If so is it an urgent fix I should send upstream now? And if so should it
also be CC'ed to stable?

cheers
```