diff --git a/src/pcm/pcm_direct.h b/src/pcm/pcm_direct.h
index 8a236970..2150bce1 100644
--- a/src/pcm/pcm_direct.h
+++ b/src/pcm/pcm_direct.h
@@ -186,6 +186,7 @@ struct snd_pcm_direct {
 			mix_areas_32_t *remix_areas_32;
 			mix_areas_24_t *remix_areas_24;
 			mix_areas_u8_t *remix_areas_u8;
+			unsigned int use_sem;
 		} dmix;
 		struct {
 			unsigned long long chn_mask;
diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c
index 843fa316..e9343b19 100644
--- a/src/pcm/pcm_dmix.c
+++ b/src/pcm/pcm_dmix.c
@@ -292,13 +292,17 @@ static void remix_areas(snd_pcm_direct_t *dmix,
  * the area via semaphore
  */
 #ifndef DOC_HIDDEN
-#ifdef NO_CONCURRENT_ACCESS
-#define dmix_down_sem(dmix) snd_pcm_direct_semaphore_down(dmix, DIRECT_IPC_SEM_CLIENT)
-#define dmix_up_sem(dmix) snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT)
-#else
-#define dmix_down_sem(dmix)
-#define dmix_up_sem(dmix)
-#endif
+static void dmix_down_sem(snd_pcm_direct_t *dmix)
+{
+	if (dmix->u.dmix.use_sem)
+		snd_pcm_direct_semaphore_down(dmix, DIRECT_IPC_SEM_CLIENT);
+}
+
+static void dmix_up_sem(snd_pcm_direct_t *dmix)
+{
+	if (dmix->u.dmix.use_sem)
+		snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT);
+}
 #endif
 
 /*
diff --git a/src/pcm/pcm_dmix_generic.c b/src/pcm/pcm_dmix_generic.c
index 40c08747..8a5b6f14 100644
--- a/src/pcm/pcm_dmix_generic.c
+++ b/src/pcm/pcm_dmix_generic.c
@@ -43,7 +43,6 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
 #ifndef ARCH_ADD
 #define ARCH_ADD(p,a) (*(p) += (a))
 #define ARCH_CMPXCHG(p,a,b) (*(p)) /* fake */
-#define NO_CONCURRENT_ACCESS	/* use semaphore to avoid race */
 #define IS_CONCURRENT	0	/* no race check */
 #endif
 
@@ -530,6 +529,7 @@ static void generic_mix_select_callbacks(snd_pcm_direct_t *dmix)
 	dmix->u.dmix.mix_areas_u8 = generic_mix_areas_u8;
 	dmix->u.dmix.remix_areas_24 = generic_remix_areas_24;
 	dmix->u.dmix.remix_areas_u8 = generic_remix_areas_u8;
+	dmix->u.dmix.use_sem = 1;
 }
 
 #endif
diff --git a/src/pcm/pcm_dmix_i386.c b/src/pcm/pcm_dmix_i386.c
index 1ab983a8..82a91c5c 100644
--- a/src/pcm/pcm_dmix_i386.c
+++ b/src/pcm/pcm_dmix_i386.c
@@ -135,4 +135,5 @@ static void mix_select_callbacks(snd_pcm_direct_t *dmix)
 		dmix->u.dmix.mix_areas_24 = smp > 1 ? mix_areas_24_smp: mix_areas_24;
 		dmix->u.dmix.remix_areas_24 = smp > 1 ? remix_areas_24_smp: remix_areas_24;
 	}
+	dmix->u.dmix.use_sem = 0;
 }
diff --git a/src/pcm/pcm_dmix_x86_64.c b/src/pcm/pcm_dmix_x86_64.c
index 34c40d4e..4d882bfd 100644
--- a/src/pcm/pcm_dmix_x86_64.c
+++ b/src/pcm/pcm_dmix_x86_64.c
@@ -102,4 +102,5 @@ static void mix_select_callbacks(snd_pcm_direct_t *dmix)
 	dmix->u.dmix.remix_areas_32 = smp > 1 ? remix_areas_32_smp : remix_areas_32;
 	dmix->u.dmix.mix_areas_24 = smp > 1 ? mix_areas_24_smp : mix_areas_24;
 	dmix->u.dmix.remix_areas_24 = smp > 1 ? remix_areas_24_smp : remix_areas_24;
+	dmix->u.dmix.use_sem = 0;
 }