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ALSA: au88x0: fix .pointer callback

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Appearently, the used mask in the .pointer callback is invalid. It should
be in period_bytes range. The period_bytes is pow(2), so simple bitwise
operation is used.

Idea was taken from ALSA bug#4455.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jaroslav Kysela 2009-05-28 14:12:27 +02:00 committed by Takashi Iwai
parent cd86a536c8
commit 3fd43858c7
1 changed files with 3 additions and 4 deletions
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7
sound/pci/au88x0/au88x0_core.c
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@ -1255,8 +1255,8 @@ static int inline vortex_adbdma_getlinearpos(vortex_t * vortex, int adbdma)
int temp;
temp = hwread(vortex->mmio, VORTEX_ADBDMA_STAT + (adbdma << 2));
temp = (dma->period_virt * dma->period_bytes) + (temp & POS_MASK);
return (temp);
temp = (dma->period_virt * dma->period_bytes) + (temp & (dma->period_bytes - 1));
return temp;
}
static void vortex_adbdma_startfifo(vortex_t * vortex, int adbdma)
@ -1504,8 +1504,7 @@ static int inline vortex_wtdma_getlinearpos(vortex_t * vortex, int wtdma)
int temp;
temp = hwread(vortex->mmio, VORTEX_WTDMA_STAT + (wtdma << 2));
//temp = (temp & POS_MASK) + (((temp>>WT_SUBBUF_SHIFT) & WT_SUBBUF_MASK)*(dma->cfg0&POS_MASK));
temp = (temp & POS_MASK) + ((dma->period_virt) * (dma->period_bytes));
temp = (dma->period_virt * dma->period_bytes) + (temp & (dma->period_bytes - 1));
return temp;
}