diff options
| author | Takashi Iwai <tiwai@suse.de> | 2008-05-12 15:43:30 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-05-12 21:27:50 +0200 |
| commit | 8965eb19386fdf5ccd0ef8b02593eb8560aa3416 (patch) | |
| tree | 8107a8db856d7b02b8b4d7bb88e53db1df8344ef /mm | |
| parent | 492c2e476eac010962850006c49df326919b284c (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>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions