Messages in this thread | | | Date | Thu, 02 May 2013 12:20:24 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH]: x86_64, audio: Fix system panic when DMA > 40 bits |
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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.
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