VC4 PixelValve and HDMI Drivers Locking Improvements for 5.13

Bug #1951616 reported by Juerg Haefliger
6
This bug affects 1 person
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linux-raspi (Ubuntu)
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Bug Description

[From]
https://github.com/raspberrypi/linux/pull/4674

[Description]
Hi,

Here's a backport for 5.13 of the series found here:
https://<email address hidden>/

This series is a follow-up of a previous discussion with upstream that pointed out we had a number of illegal accesses to KMS structures in our pixelvalves and hdmi drivers, or access done without proper care.

This series was just merged in drm-misc, is part of rpi-5.15.y already and I plan on sending a PR for 5.10 as well.

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