Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6

[mv-sheeva.git] / sound / core / isadma.c

diff --git a/sound/core/isadma.c b/sound/core/isadma.c
index 79f0f16af33930a8151a15c26a7d79bee7b8d69b..950e19ba91fca466202bcac2cc77b1efb87562fa 100644 (file)
--- 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);