[Openchrome-devel] [Bug 95420] Driver 0.4.0 crashes with recent linux kernel version

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95420

--- Comment #5 from Xavier Bachelot <xavier at bachelot.org> ---

> I have not fundamentally changed the code from the older version to the
> newer one.
> As I may have said in another reply for this subject, is this Linux kernel
> or libpciaccess problem?

fwiw, just switching from linux 4.4 to linux 4.5 triggers the failure.
libpciaccess has not been changed, nor openchrome.

This might as well be a behaviour of the driver that was tolerated before but
is not anymore and thus might warrant a fix on our side ? While looking around
the net for issues with pci_device_map_range, I've read about something similar
in mga driver which was mapping 2 crtc to the same fb for clone mode. This
worked for a time but then the driver needed to be fixed. This was circa 2010
iirc, so might be something different...
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-mga/+bug/292214/comments/8

> Perhaps, you can remove PCI_DEV_MAP_FLAG_WRITE_COMBINE to see if it helps.

I've tried that, it didn't help.

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