On 5/1/2013 11:20 PM, 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?
The dma_mask can be read from the gpu device's pci entry. I know it's a stretch to try to link to that but past history has shown that it ranges from 36 to 40 bits. > >> >> Signed-off-by: Mike Travis <tra...@sgi.com> >> Reviewed-by: Mike Habeck <hab...@sgi.com> >> --- >> sound/pci/hda/hda_intel.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c >> index bcd40ee..45eb165 100644 >> --- a/sound/pci/hda/hda_intel.c >> +++ b/sound/pci/hda/hda_intel.c >> @@ -615,7 +615,7 @@ enum { >> /* quirks for Nvidia */ >> #define AZX_DCAPS_PRESET_NVIDIA \ >> (AZX_DCAPS_NVIDIA_SNOOP | AZX_DCAPS_RIRB_DELAY | >> AZX_DCAPS_NO_MSI |\ >> - AZX_DCAPS_ALIGN_BUFSIZE) >> + AZX_DCAPS_ALIGN_BUFSIZE | AZX_DCAPS_NO_64BIT) >> >> #define AZX_DCAPS_PRESET_CTHDA \ >> (AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB | >> AZX_DCAPS_4K_BDLE_BOUNDARY) >> > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/