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Date: Fri, 7 Mar 2014 12:53:57 +0100 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: Maarten Lankhorst <maarten.lankhorst@...onical.com> Cc: Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>, Ben Skeggs <bskeggs@...hat.com>, Peter Hurley <peter@...leysoftware.com>, linux-rt-users <linux-rt-users@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, dri-devel@...ts.freedesktop.org, Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org, John Kacur <jkacur@...hat.com> Subject: Re: nouveau crash due to missing channel (WAS: Re: [ANNOUNCE] 3.12.12-rt19) * Maarten Lankhorst | 2014-03-07 12:36:13 [+0100]: >>I can't find any kind of locking so my question is what ensures that chan is >>not set to NULL between nouveau_fence_done() and >>nouveau_fence_wait_uevent()? There are just a few opcodes in between but >>nothing that pauses nouveau_fence_signal(). >Absolutely nothing. :-) Worse still, there's no guarantee that channel isn't freed, but hopefully that is less likely to be an issue. Okay, so I hit the correct spot. What do we do here? Do you want the patch I posted without the WARN_ON() or do you prefer to fix this in an other way? >~Maarten Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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