[Bug 97666] Kernel "NULL pointer dereference" with MST monitor on HSW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97666

--- Comment #7 from Jim Bride <jim.bride at linux.intel.com> ---
>From looking at the dmesg Jani posted, it seems like the NULL pointer
dereference is with the topology discovery / management code in the DRM driver.
 It's definitely the sideband worker thread that had the crash, if the stack
trace is to be trusted.  In Krill's case the crash happens in the frame buffer
helpers, but ultimately it's likely the same condition that caused the problem.
 Powering down the primary monitor likely also means powering down the primary
DP MST branch device in the case of powering down the first monitor in a series
of daisy-chained monitors.  I wouldn't necessarily expect any of the downstream
monitors to work right in that case, and honestly we probably ought to be able
to catch and deal with this case like an unplug event.  Our drivers should
handle that case gracefully, however.

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