[CCing the regression list, as it should be in the loop for regressions: https://docs.kernel.org/admin-guide/reporting-regressions.html] On 05.03.24 08:13, bumyong.lee wrote: >> we have encountered CPU stalls in mainline kernel while loading the >> bluetooth module. We have custom board based on rockchip rv1109 soc and >> there is bluetooth chipset of relatek 8821cs. CPU is stalls while realtek >> 8821cs module. >> >> Bug/Regression: >> In current mainline, we found CPU is stalls when we load bluetooth module. >> git bisect shows commit 22a9d9585812440211b0b34a6bc02ade62314be4 >> as a bad, which produce CPU stalls. >> >> git show 22a9d9585812440211b0b34a6bc02ade62314be4 >> commit 22a9d9585812440211b0b34a6bc02ade62314be4 >> Author: Bumyong Lee <bumyong.lee@xxxxxxxxxxx> >> Date: Tue Dec 19 14:50:26 2023 +0900 >> >> dmaengine: pl330: issue_pending waits until WFP state >> > [...] >> >> By reverting this commit, we have success in loading of bluetooth module. > >> Output of CPU stalls: > [...] > > I discussed this issue. Could you refer to this[1]? > I haven't received anymore reply from him after that. > If you have any more opinion, please let me know. > [1]: https://lore.kernel.org/lkml/000001da3869$ca643fa0$5f2cbee0$@samsung.com/T/ Hmmm. 6.8 final is due. Is that something we can live with? Or would it be a good idea to revert above commit for now and reapply it when something better emerged? I doubt that the answer is "yes, let's do that", but I have to ask. Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page. P.S.: To be sure the issue doesn't fall through the cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression tracking bot: #regzbot report / #regzbot introduced 22a9d9585812440211b #regzbot duplicate: https://lore.kernel.org/lkml/ZYhQ2-OnjDgoqjvt@xxxxxxx/ #regzbot title dmaengine: CPU stalls while loading bluetooth module #regzbot ignore-activity
