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Message-ID: <5182AE68.9010905@wwwdotorg.org> Date: Thu, 02 May 2013 12:20:24 -0600 From: Stephen Warren <swarren@...dotorg.org> To: David Henningsson <david.henningsson@...onical.com> CC: Mike Travis <travis@....com>, Stephen Warren <swarren@...dia.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>, Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>, alsa-devel@...a-project.org, linux-kernel@...r.kernel.org, Russ Anderson <rja@....com> Subject: Re: [PATCH]: x86_64, audio: Fix system panic when DMA > 40 bits On 05/02/2013 12:20 AM, David Henningsson wrote: > On 05/01/2013 09:04 PM, Mike Travis wrote: >> The audio driver mistakenly allows 64 bit addresses to be created for >> the audio driver on Nvidia GPUs. Unfortunately, the hardware normally >> only supports up to 40 bits of DMA. This can cause system panics as >> well as misdirected data when the address is > 40 bits as the upper >> part the address is truncated. > > Thanks for this patch. Stephen Warren, is this something you can > confirm/deny, and do you know what range of hardware this actually > applies to? It's certainly plausible that the GPU's internal physical addresses are less than a full 64-bits, and this probably affects PCI accesses too. -- 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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