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| author | Takashi Iwai <tiwai@suse.de> | 2009-12-01 15:58:10 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-12-01 15:58:10 +0100 |
| commit | 75639e7ee1401b3876c7a00ffe96ea8027668690 (patch) | |
| tree | 3d6813cd3fe0d974e0a40237d003a22c5f7438dd /sound/core/isadma.c | |
| parent | 7584af10cf46e0f4aa1696f1be79fa0f19a945ba (diff) | |
| parent | ad1cd745060ae2f24026b3b3d09da3426df6ab36 (diff) | |
| download | blackbird-op-linux-75639e7ee1401b3876c7a00ffe96ea8027668690.tar.gz blackbird-op-linux-75639e7ee1401b3876c7a00ffe96ea8027668690.zip | |
Merge branch 'topic/beep-rename' into topic/core-change
Diffstat (limited to 'sound/core/isadma.c')
| -rw-r--r-- | sound/core/isadma.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sound/core/isadma.c b/sound/core/isadma.c index 79f0f16af339..950e19ba91fc 100644 --- a/sound/core/isadma.c +++ b/sound/core/isadma.c @@ -85,16 +85,24 @@ EXPORT_SYMBOL(snd_dma_disable); unsigned int snd_dma_pointer(unsigned long dma, unsigned int size) { unsigned long flags; - unsigned int result; + unsigned int result, result1; flags = claim_dma_lock(); clear_dma_ff(dma); if (!isa_dma_bridge_buggy) disable_dma(dma); result = get_dma_residue(dma); + /* + * HACK - read the counter again and choose higher value in order to + * avoid reading during counter lower byte roll over if the + * isa_dma_bridge_buggy is set. + */ + result1 = get_dma_residue(dma); if (!isa_dma_bridge_buggy) enable_dma(dma); release_dma_lock(flags); + if (unlikely(result < result1)) + result = result1; #ifdef CONFIG_SND_DEBUG if (result > size) snd_printk(KERN_ERR "pointer (0x%x) for DMA #%ld is greater than transfer size (0x%x)\n", result, dma, size); |
