linux-kernel - Re: [regression] usb and thunderbould are misbehaving or broken due to iommu/vt-d change

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Message-ID: <CAOcK=CN3-v=dgMC9XTbh-h0zaD01uatOZKjvSF7ocofTCOGp7Q@mail.gmail.com>
Date: Thu, 29 Aug 2024 08:21:20 +0200
From: Markus Rathgeb <maggu2810@...il.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
Cc: Linux regressions mailing list <regressions@...ts.linux.dev>, Lu Baolu <baolu.lu@...ux.intel.com>, 
	Will Deacon <will@...nel.org>, David Woodhouse <dwmw2@...radead.org>, Joerg Roedel <joro@...tes.org>, 
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, LKML <linux-kernel@...r.kernel.org>, 
	Jacob Pan <jacob.jun.pan@...ux.intel.com>, Adam Williamson <awilliam@...hat.com>
Subject: Re: [regression] usb and thunderbould are misbehaving or broken due
 to iommu/vt-d change

> Probably f90584f4beb8 ("iommu/vt-d: Add helper to flush caches
> for context change") is more relevant. There was a bug reported
> against it and fixed a few days ago:

I added a comment on bugzilla, too.
While adding additional logs to the bugzilla entry I realized that one
commit has not been tested.

good: 804f98e224e41c16e3b70f97790f84894745a392
untested: 2b989ab9bc89b29dd4b5509408b8fa42337eda56
bad: f90584f4beb84211c4d21b319cc13f391fe9f3c2

I do not understand why git bisect told me there is no remaining commit to test.