Re: [PATCH v2] media: verisilicon: Fix crash when probing encoder

[Linux regression tracking (Thorsten Leemhuis)]

CCing the Regression list and a bunch of other people that were CCed in
threads that look related:

On 23.05.23 00:38, Diederik de Haas wrote:
> On Monday, 22 May 2023 18:17:39 CEST Benjamin Gaignard wrote:
>> Le 20/05/2023 à 00:34, Diederik de Haas a écrit :
>>> On Thursday, 13 April 2023 21:52:50 CEST Nicolas Dufresne wrote:
> [...]
>>> When I booted into my 6.4-rc1 (but also rc2) kernel on my
>>> Pine64 Quartz64 Model A, I noticed a crash which seems the same as
>>> above, but I didn't have such a crash with my 6.3 kernel.
>>> Searching for 'hantro' led me to this commit as the most likely culprit
>>> but when I build a new 6.4-rcX kernel with this commit reverted,
>>> I still had this crash.
>>> Do you have suggestions which commit would then be the likely culprit?
>>
>> This patch fix the crash at boot time, revert it doesn't seem to be the
>> solution. Maybe this proposal from Marek can help you ?
>>
>> https://patchwork.kernel.org/project/linux-media/patch/20230421104759.2236463-1-m.szyprowski@xxxxxxxxxxx/
> 
> That helped :) After applying that patch I no longer have the crash.
> Thanks!

That regression fix is now a month old, but not yet merged afaics --
guess due to Nicolas comment that wasn't addressed yet and likely
requires a updated patch.

Michael afaics a week ago posted a patch that to my *very limited
understanding of things* (I hope I don't confuse matters here!) seems to
address the same problem, but slightly differently:
https://lore.kernel.org/all/20230516091209.3098262-1-m.tretter@xxxxxxxxxxxxxx/

No reply yet.

That's all a bit unfortunate, as it's not how regression fixes should be
dealt with -- and caused multiple people headaches that could have been
avoided. :-/

But well, things happen. But it leads to the question:

How can we finally address the issue quickly now to ensure is doesn't
cause headaches for even more people?

Marek, Michael, could you work on a patch together that we then get
somewhat fast-tracked to Linus to avoid him getting even more unhappy
about the state of things[1]?

Ciao, Thorsten

[1] see
https://lore.kernel.org/all/CAHk-=wgzU8_dGn0Yg+DyX7ammTkDUCyEJ4C=NvnHRhxKWC7Wpw@xxxxxxxxxxxxxx/