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

- From: Alexey Kardashevskiy \<hidden\>
- Date: 2016-02-17 07:29:53 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/02/9488182
- Thread: https://ratatoskr.run/linuxppc-dev/2016/01/9487572/t.md

```text
On 02/16/2016 02:18 PM, Michael Ellerman wrote:
> 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?

Just posted.

> If so is it an urgent fix I should send upstream now?

Yes.

> And if so should it also be CC'ed to stable?

Ben suggested that yes, it should. Thanks. Sorry about breaking things.


-- 
Alexey
```