--- sound/pci/echoaudio/echoaudio.c

+++ sound/pci/echoaudio/echoaudio.c

@@ -1821,7 +1821,9 @@ static irqreturn_t snd_echo_interrupt(in

/* The hardware doesn't tell us which substream caused the irq,

thus we have to check all running substreams. */

for (ss = 0; ss < DSP_MAXPIPES; ss++) {

- if ((substream = chip->substream[ss])) {

+ substream = chip->substream[ss];

+ if (substream && ((struct audiopipe *)substream->runtime->

+ private_data)->state == PIPE_STATE_STARTED) {

period = pcm_pointer(substream) /

substream->runtime->period_size;

if (period != chip->last_period[ss]) {