diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c
index 80fb2ba..b0adc80 100644
--- a/sound/pci/ctxfi/ctatc.c
+++ b/sound/pci/ctxfi/ctatc.c
@@ -259,7 +259,6 @@
 	int n_amixer = apcm->substream->runtime->channels, i = 0;
 	int device = apcm->substream->pcm->device;
 	unsigned int pitch;
-	unsigned long flags;
 
 	if (NULL != apcm->src) {
 		/* Prepared pcm playback */
@@ -311,10 +310,10 @@
 	src = apcm->src;
 	for (i = 0; i < n_amixer; i++) {
 		amixer = apcm->amixers[i];
-		spin_lock_irqsave(&atc->atc_lock, flags);
+		mutex_lock(&atc->atc_mutex);
 		amixer->ops->setup(amixer, &src->rsc,
 					INIT_VOL, atc->pcm[i+device*2]);
-		spin_unlock_irqrestore(&atc->atc_lock, flags);
+		mutex_unlock(&atc->atc_mutex);
 		src = src->ops->next_interleave(src);
 		if (NULL == src)
 			src = apcm->src;
@@ -865,7 +864,6 @@
 spdif_passthru_playback_setup(struct ct_atc *atc, struct ct_atc_pcm *apcm)
 {
 	struct dao *dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
-	unsigned long flags;
 	unsigned int rate = apcm->substream->runtime->rate;
 	unsigned int status;
 	int err;
@@ -885,7 +883,7 @@
 		return -ENOENT;
 	}
 
-	spin_lock_irqsave(&atc->atc_lock, flags);
+	mutex_lock(&atc->atc_mutex);
 	dao->ops->get_spos(dao, &status);
 	if (((status >> 24) & IEC958_AES3_CON_FS) != iec958_con_fs) {
 		status &= ((~IEC958_AES3_CON_FS) << 24);
@@ -895,7 +893,7 @@
 	}
 	if ((rate != atc->pll_rate) && (32000 != rate))
 		err = atc_pll_init(atc, rate);
-	spin_unlock_irqrestore(&atc->atc_lock, flags);
+	mutex_unlock(&atc->atc_mutex);
 
 	return err;
 }
@@ -908,7 +906,6 @@
 	struct dao *dao;
 	int err;
 	int i;
-	unsigned long flags;
 
 	if (NULL != apcm->src)
 		return 0;
@@ -934,13 +931,13 @@
 			src = apcm->src;
 	}
 	/* Connect to SPDIFOO */
-	spin_lock_irqsave(&atc->atc_lock, flags);
+	mutex_lock(&atc->atc_mutex);
 	dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
 	amixer = apcm->amixers[0];
 	dao->ops->set_left_input(dao, &amixer->rsc);
 	amixer = apcm->amixers[1];
 	dao->ops->set_right_input(dao, &amixer->rsc);
-	spin_unlock_irqrestore(&atc->atc_lock, flags);
+	mutex_unlock(&atc->atc_mutex);
 
 	ct_timer_prepare(apcm->timer);
 
@@ -1088,7 +1085,6 @@
 
 static int atc_spdif_out_passthru(struct ct_atc *atc, unsigned char state)
 {
-	unsigned long flags;
 	struct dao_desc da_dsc = {0};
 	struct dao *dao;
 	int err;
@@ -1096,7 +1092,7 @@
 	struct rsc *rscs[2] = {NULL};
 	unsigned int spos = 0;
 
-	spin_lock_irqsave(&atc->atc_lock, flags);
+	mutex_lock(&atc->atc_mutex);
 	dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
 	da_dsc.msr = state ? 1 : atc->msr;
 	da_dsc.passthru = state ? 1 : 0;
@@ -1114,7 +1110,7 @@
 	}
 	dao->ops->set_spos(dao, spos);
 	dao->ops->commit_write(dao);
-	spin_unlock_irqrestore(&atc->atc_lock, flags);
+	mutex_unlock(&atc->atc_mutex);
 
 	return err;
 }
@@ -1572,7 +1568,7 @@
 	atc->msr = msr;
 	atc->chip_type = chip_type;
 
-	spin_lock_init(&atc->atc_lock);
+	mutex_init(&atc->atc_mutex);
 
 	/* Find card model */
 	err = atc_identify_card(atc);