[bugzilla-daemon@bugzilla.kernel.org: [Bug 208507] New: BISECTED: i2c timeout loading module ddbridge with commit d2345d1231d80ecbea5fb764eb43123440861462]

[Bjorn Helgaas <helgaas@kernel.org>]

Bisected to Debian commit d2345d1231d8, which is a backport of the
upstream commit b88bf6c3b6ff ("PCI: Add boot interrupt quirk mechanism
for Xeon chipsets").

Reporter confirmed that reverting the Debian backport from 4.19.132
fixes the problem.

----- Forwarded message from bugzilla-daemon@bugzilla.kernel.org -----

Date: Thu, 09 Jul 2020 15:01:11 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: bjorn@helgaas.com
Subject: [Bug 208507] New: BISECTED: i2c timeout loading module ddbridge with
	commit d2345d1231d80ecbea5fb764eb43123440861462
Message-ID: <bug-208507-41252@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=208507

            Bug ID: 208507
           Summary: BISECTED: i2c timeout loading module ddbridge with
                    commit d2345d1231d80ecbea5fb764eb43123440861462
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19.132
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PCI
          Assignee: drivers_pci@kernel-bugs.osdl.org
          Reporter: bernhard@turmann.eu
        Regression: Yes

Created attachment 290179
  --> https://bugzilla.kernel.org/attachment.cgi?id=290179&action=edit
dmesg on 4.19.132

OS: Debian 10.4 Buster
CPU: Intel(R) Xeon(R) CPU D-1541 @ 2.10GHz
Hardware: Supermicro  Super Server
Mainboard: Supermicro X10SDV
DVB card: Digital Devices Cine S2 V7 Advanced DVB adapter

Issue:
=====
Loading kernel module ddbridge fails with i2c timeouts, see attached dmesg. The
dvb media adapter is unusable.
This happened after Linux kernel upgrade from 4.19.98-1+deb10u1 to
4.19.118-2+deb10u1.

A git bisect based on the Debian kernel repo on branch buster identified as
first bad commit: [1fb0eb795661ab9e697c3a053b35aa4dc3b81165] Update to
4.19.116.

Another git bisect based on upstream Linux kernel repo on branch v4.19.y
identified as first bad commit: [d2345d1231d80ecbea5fb764eb43123440861462] PCI:
Add boot interrupt quirk mechanism for Xeon chipsets.

Other affected Debian kernel version: 5.6.14+2~bpo10+1
I tested this version via buster-backports, because so far I was unable to
build my own kernel from 5.6.y or even 5.7.y.

Workaround:
==========
Reverting the mentioned commit d2345d1231d80ecbea5fb764eb43123440861462 on top
of 4.19.132 is fixing the problem. Reverting the same commit on 4.19.118 or
4.19.116 is also fixing the problem.

It seems, I can only add one attachment now, so I will add more attachments
later after bug is submitted.

Thanks and Regards
Berni

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