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ALSA: au88x0: Give comment for vortex_wtdma_bufshift() issue 

The check of the return value from vortex_wtdma_bufshft() in
vortex_interrupt() is useless as it executes no code.  Actually the
return value is intentionally ignored because the delta calculation
for wavetable doesn't work always correctly.  For avoiding the
confusion, a comment is added and the superfluous if () is removed.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-10-25 13:55:51 +02:00
parent f598158aa4
commit 7dd7a2fd7e
1 changed files with 6 additions and 1 deletions
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7
sound/pci/au88x0/au88x0_core.c
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@ -2461,7 +2461,12 @@ static irqreturn_t vortex_interrupt(int irq, void *dev_id)
#ifndef CHIP_AU8810
for (i = 0; i < NR_WT; i++) {
if (vortex->dma_wt[i].fifo_status == FIFO_START) {
if (vortex_wtdma_bufshift(vortex, i)) ;
/* FIXME: we ignore the return value from
* vortex_wtdma_bufshift() below as the delta
* calculation seems not working for wavetable
* by some reason
*/
vortex_wtdma_bufshift(vortex, i);
spin_unlock(&vortex->lock);
snd_pcm_period_elapsed(vortex->dma_wt[i].
substream);