Hi,
On 15-03-18 14:15, Marcel Holtmann wrote:
Hi Lukas,
We're quite far into the cycle already and this is a serious regression,
also nothing of great value is lost by the revert, the original commit
was a minor cleanup which turns out to have bad side-effects, a simple
revert really is the best solution here, esp. in this point of the cycle.
Just an hour ago he sent me the patch to look over it. And we're at
least two and a half weeks away from v4.16.
No we are *only* two and a half weeks away from v4.16 (worst case scenario)
and Linus does not like getting last minute fixes.
That doesn't preclude allowing a few hours to discuss things.
There is never such a rush. In the present case, a new contributor
was willing to debug the issue and submit a patch. Onboarding new
contributors is important and IMO it's worth waiting a few days for
them to sort things out, even if it means a regression stays present
a little longer. I'm sorry that it meant you wasted time debugging
it in parallel.
That said, when submitting the patch I clearly failed to notice that
for devices using autosuspend, pm_request_resume() doesn't update
the last usage timestamp. While that could be fixed by calling
pm_runtime_mark_last_busy() before pm_request_resume(), it doesn't
seem to be customary as a look at all the call sites of
pm_request_resume() shows. The original three-line sequence,
although quite verbose, appears to be what is commonly used in such
a case. For this reason reverting back to the original version
seems justified.
there is no reason to rush this through. With a properly worded commit message that explain the reason, I have no problem to do a last minute -rc inclusion.
However what I like to have is a single patch with all Acks and also CC: stable tags if required that we can just send off in the direction towards Linus. I saw there is an alternative patch on the mailing list. So I would like to have a good conclusion on what goes to -rc and that we all agree.
I think we are all in agreement now to just go with the revert patch which I did,
Lucas acked that patch this morning.
Regards,
Hans
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