linux-kernel - Re: 3.18-rc regression: drm/nouveau: use shared fences for readable objects

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Message-ID: <CAA85sZs6u08DxzV3gF3r-=LvBry0vUFMtfvG1pXRbz1FG6wnag@mail.gmail.com>
Date:	Sat, 29 Nov 2014 01:51:20 +0100
From:	Ian Kumlien <ian.kumlien@...il.com>
To:	maarten.lankhorst@...onical.com
Cc:	mike@...ineau.org, tobias.johannes.klausmann@....thm.de,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: 3.18-rc regression: drm/nouveau: use shared fences for readable objects

Hi,

Sorry to but in like this but I'm suffering from the same kind of
deadlocks with nouveau...

The really odd thing is that i could boot some -rc6+ kernel without
problems but it hung
while playing video and then it refused to start properly again.


Anyway, to quote Maarten:
Ok that most likely means the interrupt based wait is borked somehow,
so lets find \
out why..

I fear that this happens because of a race in the interface, so my
first attempt will \
rule out abuse of the nvif api by nouveau_fence.c

Can you test below patch with the default wait function?
---

I tried the patch, straight on Linus' master and it didn't change
anything for me :(
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