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| author | Takashi Iwai <tiwai@suse.de> | 2008-05-09 08:06:55 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-05-13 09:51:53 -0700 |
| commit | 4a367f3a9dbf2e7ffcee4702203479809236ee6e (patch) | |
| tree | 8481ac4f6d916f7d4322d3cee235131f537819c8 /drivers/pci/pci-acpi.c | |
| parent | 21e2b0a5efb3a01de58e7cb630f2eb70894da352 (diff) | |
| download | linux-stable-4a367f3a9dbf2e7ffcee4702203479809236ee6e.tar.gz linux-stable-4a367f3a9dbf2e7ffcee4702203479809236ee6e.tar.bz2 linux-stable-4a367f3a9dbf2e7ffcee4702203479809236ee6e.zip | |
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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
0 files changed, 0 insertions, 0 deletions