[Bug 201035] New: I2C bus probing crash on OpenChrome DRM

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201035

            Bug ID: 201035
           Summary: I2C bus probing crash on OpenChrome DRM
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19 rc1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: kevinbrace at gmx.com
        Regression: No

OpenChrome DRM was working fine (i.e., able to normally boot Xubuntu 16.04)
until DRM maintainer's version of Linux 4.18 rc4.
When I upgraded to Linux 4.18 rc7, it stopped working.
I also upgraded to Linux 4.19 rc1, but it crashes for a similar reason.
It appears that there is a NULL pointer reference when probing for I2C bus.
The bug was observed on HP 2133 mini-note and VIA Embedded EPIA-M830 mainboard.

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