Comment # 1
on bug 91481
from Adam J. Richter
Thank you, Dave Arlie, and anyone else involved, for the DisplayPort
MultiStream Transport fixes in Linux 4.1.6 and 4.2 (and a few of the
subreleases and release candidates leading up to these versions).
However, I think that some change along the lines of the patch that I mentioned
may still be necessary. I cannot be sure, because when I try to boot
linux-4.1.6, I get a other kernels bugs either before I get a chance to test
this or while I am testing it. I am pretty sure I tried Linux-4.2 and observed
the kernel getting fault that would go away when I would apply the attached
patch.
It looks to me like, toward the end of drm_dp_add_port in Linux-4.2, I still
see the following code:
drm_dp_send_link_address(mstb->mgr, port->mstb);
port->mstb->link_address_sent = true;
...and drm_dp_send_link_address has this line, which I think can call a
function that can change port->mstb:
(*mgr->cbs->hotplug)(mgr);
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