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authorTakashi Iwai <tiwai@suse.de>2008-05-12 15:43:30 +0200
committerIngo Molnar <mingo@elte.hu>2008-05-12 21:27:50 +0200
commit8965eb19386fdf5ccd0ef8b02593eb8560aa3416 (patch)
tree8107a8db856d7b02b8b4d7bb88e53db1df8344ef /scripts
parent492c2e476eac010962850006c49df326919b284c (diff)
x86/pci: fix broken ISA DMA
Rene Herman reported: > commit 8779f2fc3b84ebb6c5181fb13d702e9944c16069 > > "x86: don't try to allocate from DMA zone at first" > > breaks all of ISA DMA. Or all of ALSA ISA DMA at least. All > ISA soundcards are silent following that commit -- no error > messages, everything appears fine, just silence. That patch is buggy. We had an implicit assumption that dev = NULL for ISA devices that require 24bit DMA. The recent work on x86 dma_alloc_coherent() breaks the ISA DMA buffer allocation, which is represented by "dev = NULL" and requires 24bit DMA implicitly. Bisected-by: Rene Herman <rene.herman@keyaccess.nl> Signed-off-by: Takashi Iwai <tiwai@suse.de> Tested-by: Rene Herman <rene.herman@keyaccess.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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