30 files changed, 49 insertions, 49 deletions

diff --git a/src/pcm/pcm_adpcm.c b/src/pcm/pcm_adpcm.c
index 29599f3e..b68007f9 100644
--- a/src/pcm/pcm_adpcm.c
+++ b/src/pcm/pcm_adpcm.c
@@ -518,7 +518,7 @@ static void snd_pcm_adpcm_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(adpcm->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_adpcm_ops = {
+static const snd_pcm_ops_t snd_pcm_adpcm_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_adpcm_hw_refine,
diff --git a/src/pcm/pcm_alaw.c b/src/pcm/pcm_alaw.c
index 3814241a..09ad4819 100644
--- a/src/pcm/pcm_alaw.c
+++ b/src/pcm/pcm_alaw.c
@@ -391,7 +391,7 @@ static void snd_pcm_alaw_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(alaw->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_alaw_ops = {
+static const snd_pcm_ops_t snd_pcm_alaw_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_alaw_hw_refine,
diff --git a/src/pcm/pcm_copy.c b/src/pcm/pcm_copy.c
index 9d3eb385..072bb125 100644
--- a/src/pcm/pcm_copy.c
+++ b/src/pcm/pcm_copy.c
@@ -152,7 +152,7 @@ static void snd_pcm_copy_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(copy->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_copy_ops = {
+static const snd_pcm_ops_t snd_pcm_copy_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_copy_hw_refine,
diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c
index bb79ec61..5b967e86 100644
--- a/src/pcm/pcm_dmix.c
+++ b/src/pcm/pcm_dmix.c
@@ -869,7 +869,7 @@ static void snd_pcm_dmix_dump(snd_pcm_t *pcm, snd_output_t *out)
 		snd_pcm_dump(dmix->spcm, out);
 }
 
-static snd_pcm_ops_t snd_pcm_dmix_ops = {
+static const snd_pcm_ops_t snd_pcm_dmix_ops = {
 	.close = snd_pcm_dmix_close,
 	.info = snd_pcm_direct_info,
 	.hw_refine = snd_pcm_direct_hw_refine,
@@ -884,7 +884,7 @@ static snd_pcm_ops_t snd_pcm_dmix_ops = {
 	.munmap = snd_pcm_direct_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_dmix_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_dmix_fast_ops = {
 	.status = snd_pcm_dmix_status,
 	.state = snd_pcm_dmix_state,
 	.hwsync = snd_pcm_dmix_hwsync,
diff --git a/src/pcm/pcm_dshare.c b/src/pcm/pcm_dshare.c
index bfe66a8b..c91fa3b1 100644
--- a/src/pcm/pcm_dshare.c
+++ b/src/pcm/pcm_dshare.c
@@ -560,7 +560,7 @@ static void snd_pcm_dshare_dump(snd_pcm_t *pcm, snd_output_t *out)
 		snd_pcm_dump(dshare->spcm, out);
 }
 
-static snd_pcm_ops_t snd_pcm_dshare_ops = {
+static const snd_pcm_ops_t snd_pcm_dshare_ops = {
 	.close = snd_pcm_dshare_close,
 	.info = snd_pcm_direct_info,
 	.hw_refine = snd_pcm_direct_hw_refine,
@@ -575,7 +575,7 @@ static snd_pcm_ops_t snd_pcm_dshare_ops = {
 	.munmap = snd_pcm_direct_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_dshare_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_dshare_fast_ops = {
 	.status = snd_pcm_dshare_status,
 	.state = snd_pcm_dshare_state,
 	.hwsync = snd_pcm_dshare_hwsync,
diff --git a/src/pcm/pcm_dsnoop.c b/src/pcm/pcm_dsnoop.c
index 1f602c3f..9d42c123 100644
--- a/src/pcm/pcm_dsnoop.c
+++ b/src/pcm/pcm_dsnoop.c
@@ -455,7 +455,7 @@ static void snd_pcm_dsnoop_dump(snd_pcm_t *pcm, snd_output_t *out)
 		snd_pcm_dump(dsnoop->spcm, out);
 }
 
-static snd_pcm_ops_t snd_pcm_dsnoop_ops = {
+static const snd_pcm_ops_t snd_pcm_dsnoop_ops = {
 	.close = snd_pcm_dsnoop_close,
 	.info = snd_pcm_direct_info,
 	.hw_refine = snd_pcm_direct_hw_refine,
@@ -470,7 +470,7 @@ static snd_pcm_ops_t snd_pcm_dsnoop_ops = {
 	.munmap = snd_pcm_direct_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_dsnoop_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_dsnoop_fast_ops = {
 	.status = snd_pcm_dsnoop_status,
 	.state = snd_pcm_dsnoop_state,
 	.hwsync = snd_pcm_dsnoop_hwsync,
diff --git a/src/pcm/pcm_extplug.c b/src/pcm/pcm_extplug.c
index 31d8d946..a34706ff 100644
--- a/src/pcm/pcm_extplug.c
+++ b/src/pcm/pcm_extplug.c
@@ -425,7 +425,7 @@ static int snd_pcm_extplug_close(snd_pcm_t *pcm)
 	return 0;
 }
 
-static snd_pcm_ops_t snd_pcm_extplug_ops = {
+static const snd_pcm_ops_t snd_pcm_extplug_ops = {
 	.close = snd_pcm_extplug_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_extplug_hw_refine,
diff --git a/src/pcm/pcm_file.c b/src/pcm/pcm_file.c
index 376dac0d..82823a04 100644
--- a/src/pcm/pcm_file.c
+++ b/src/pcm/pcm_file.c
@@ -460,7 +460,7 @@ static void snd_pcm_file_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(file->gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_file_ops = {
+static const snd_pcm_ops_t snd_pcm_file_ops = {
 	.close = snd_pcm_file_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_generic_hw_refine,
@@ -475,7 +475,7 @@ static snd_pcm_ops_t snd_pcm_file_ops = {
 	.munmap = snd_pcm_generic_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_file_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_file_fast_ops = {
 	.status = snd_pcm_generic_status,
 	.state = snd_pcm_generic_state,
 	.hwsync = snd_pcm_generic_hwsync,
diff --git a/src/pcm/pcm_hooks.c b/src/pcm/pcm_hooks.c
index 0abe8191..826685f8 100644
--- a/src/pcm/pcm_hooks.c
+++ b/src/pcm/pcm_hooks.c
@@ -121,7 +121,7 @@ static void snd_pcm_hooks_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(h->gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_hooks_ops = {
+static const snd_pcm_ops_t snd_pcm_hooks_ops = {
 	.close = snd_pcm_hooks_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_generic_hw_refine,
@@ -136,7 +136,7 @@ static snd_pcm_ops_t snd_pcm_hooks_ops = {
 	.munmap = snd_pcm_generic_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_hooks_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_hooks_fast_ops = {
 	.status = snd_pcm_generic_status,
 	.state = snd_pcm_generic_state,
 	.hwsync = snd_pcm_generic_hwsync,
diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c
index c8d9a627..e9ce0927 100644
--- a/src/pcm/pcm_hw.c
+++ b/src/pcm/pcm_hw.c
@@ -80,8 +80,8 @@ struct sndrv_pcm_hw_params_old {
 
 static int use_old_hw_params_ioctl(int fd, unsigned int cmd, snd_pcm_hw_params_t *params);
 static snd_pcm_sframes_t snd_pcm_hw_avail_update(snd_pcm_t *pcm);
-static snd_pcm_fast_ops_t snd_pcm_hw_fast_ops;
-static snd_pcm_fast_ops_t snd_pcm_hw_fast_ops_timer;
+static const snd_pcm_fast_ops_t snd_pcm_hw_fast_ops;
+static const snd_pcm_fast_ops_t snd_pcm_hw_fast_ops_timer;
 
 /*
  *
@@ -1040,7 +1040,7 @@ static void snd_pcm_hw_dump(snd_pcm_t *pcm, snd_output_t *out)
 	}
 }
 
-static snd_pcm_ops_t snd_pcm_hw_ops = {
+static const snd_pcm_ops_t snd_pcm_hw_ops = {
 	.close = snd_pcm_hw_close,
 	.info = snd_pcm_hw_info,
 	.hw_refine = snd_pcm_hw_hw_refine,
@@ -1055,7 +1055,7 @@ static snd_pcm_ops_t snd_pcm_hw_ops = {
 	.munmap = snd_pcm_hw_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_hw_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_hw_fast_ops = {
 	.status = snd_pcm_hw_status,
 	.state = snd_pcm_hw_state,
 	.hwsync = snd_pcm_hw_hwsync,
@@ -1086,7 +1086,7 @@ static snd_pcm_fast_ops_t snd_pcm_hw_fast_ops = {
 	.poll_revents = NULL,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_hw_fast_ops_timer = {
+static const snd_pcm_fast_ops_t snd_pcm_hw_fast_ops_timer = {
 	.status = snd_pcm_hw_status,
 	.state = snd_pcm_hw_state,
 	.hwsync = snd_pcm_hw_hwsync,
diff --git a/src/pcm/pcm_iec958.c b/src/pcm/pcm_iec958.c
index 5e4858db..3d70ed0f 100644
--- a/src/pcm/pcm_iec958.c
+++ b/src/pcm/pcm_iec958.c
@@ -416,7 +416,7 @@ static void snd_pcm_iec958_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(iec->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_iec958_ops = {
+static const snd_pcm_ops_t snd_pcm_iec958_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_iec958_hw_refine,
diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index 393dfa40..e43d3548 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -747,7 +747,7 @@ static int snd_pcm_ioplug_close(snd_pcm_t *pcm)
 	return 0;
 }
 
-static snd_pcm_ops_t snd_pcm_ioplug_ops = {
+static const snd_pcm_ops_t snd_pcm_ioplug_ops = {
 	.close = snd_pcm_ioplug_close,
 	.nonblock = snd_pcm_ioplug_nonblock,
 	.async = snd_pcm_ioplug_async,
@@ -762,7 +762,7 @@ static snd_pcm_ops_t snd_pcm_ioplug_ops = {
 	.munmap = snd_pcm_ioplug_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_ioplug_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_ioplug_fast_ops = {
 	.status = snd_pcm_ioplug_status,
 	.prepare = snd_pcm_ioplug_prepare,
 	.reset = snd_pcm_ioplug_reset,
diff --git a/src/pcm/pcm_ladspa.c b/src/pcm/pcm_ladspa.c
index 97bb9014..51618201 100644
--- a/src/pcm/pcm_ladspa.c
+++ b/src/pcm/pcm_ladspa.c
@@ -1061,7 +1061,7 @@ static void snd_pcm_ladspa_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(ladspa->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_ladspa_ops = {
+static const snd_pcm_ops_t snd_pcm_ladspa_ops = {
 	.close = snd_pcm_ladspa_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_ladspa_hw_refine,
diff --git a/src/pcm/pcm_lfloat.c b/src/pcm/pcm_lfloat.c
index 883fce96..62eb398e 100644
--- a/src/pcm/pcm_lfloat.c
+++ b/src/pcm/pcm_lfloat.c
@@ -350,7 +350,7 @@ static void snd_pcm_lfloat_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(lfloat->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_lfloat_ops = {
+static const snd_pcm_ops_t snd_pcm_lfloat_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_lfloat_hw_refine,
diff --git a/src/pcm/pcm_linear.c b/src/pcm/pcm_linear.c
index e3aeac15..12e2e7f0 100644
--- a/src/pcm/pcm_linear.c
+++ b/src/pcm/pcm_linear.c
@@ -407,7 +407,7 @@ static void snd_pcm_linear_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(linear->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_linear_ops = {
+static const snd_pcm_ops_t snd_pcm_linear_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_linear_hw_refine,
diff --git a/src/pcm/pcm_local.h b/src/pcm/pcm_local.h
index b118f4b2..9aa81e14 100644
--- a/src/pcm/pcm_local.h
+++ b/src/pcm/pcm_local.h
@@ -223,8 +223,8 @@ struct _snd_pcm {
 	snd_pcm_channel_info_t *mmap_channels;
 	snd_pcm_channel_area_t *running_areas;
 	snd_pcm_channel_area_t *stopped_areas;
-	snd_pcm_ops_t *ops;
-	snd_pcm_fast_ops_t *fast_ops;
+	const snd_pcm_ops_t *ops;
+	const snd_pcm_fast_ops_t *fast_ops;
 	snd_pcm_t *op_arg;
 	snd_pcm_t *fast_op_arg;
 	void *private_data;
diff --git a/src/pcm/pcm_meter.c b/src/pcm/pcm_meter.c
index 83d643a4..0357921b 100644
--- a/src/pcm/pcm_meter.c
+++ b/src/pcm/pcm_meter.c
@@ -501,7 +501,7 @@ static void snd_pcm_meter_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(meter->gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_meter_ops = {
+static const snd_pcm_ops_t snd_pcm_meter_ops = {
 	.close = snd_pcm_meter_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_meter_hw_refine,
@@ -516,7 +516,7 @@ static snd_pcm_ops_t snd_pcm_meter_ops = {
 	.munmap = snd_pcm_generic_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_meter_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_meter_fast_ops = {
 	.status = snd_pcm_generic_status,
 	.state = snd_pcm_generic_state,
 	.hwsync = snd_pcm_generic_hwsync,
@@ -1143,7 +1143,7 @@ static void s16_reset(snd_pcm_scope_t *scope)
 	s16->old = meter->now;
 }
 
-snd_pcm_scope_ops_t s16_ops = {
+static const snd_pcm_scope_ops_t s16_ops = {
 	.enable = s16_enable,
 	.disable = s16_disable,
 	.close = s16_close,
diff --git a/src/pcm/pcm_mmap_emul.c b/src/pcm/pcm_mmap_emul.c
index 489aa773..0dc19736 100644
--- a/src/pcm/pcm_mmap_emul.c
+++ b/src/pcm/pcm_mmap_emul.c
@@ -329,7 +329,7 @@ static void snd_pcm_mmap_emul_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(map->gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_mmap_emul_ops = {
+static const snd_pcm_ops_t snd_pcm_mmap_emul_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_mmap_emul_hw_refine,
@@ -344,7 +344,7 @@ static snd_pcm_ops_t snd_pcm_mmap_emul_ops = {
 	.munmap = snd_pcm_generic_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_mmap_emul_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_mmap_emul_fast_ops = {
 	.status = snd_pcm_generic_status,
 	.state = snd_pcm_generic_state,
 	.hwsync = snd_pcm_generic_hwsync,
diff --git a/src/pcm/pcm_mulaw.c b/src/pcm/pcm_mulaw.c
index d696c968..22e7d969 100644
--- a/src/pcm/pcm_mulaw.c
+++ b/src/pcm/pcm_mulaw.c
@@ -406,7 +406,7 @@ static void snd_pcm_mulaw_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(mulaw->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_mulaw_ops = {
+static const snd_pcm_ops_t snd_pcm_mulaw_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_mulaw_hw_refine,
diff --git a/src/pcm/pcm_multi.c b/src/pcm/pcm_multi.c
index 9b8583ce..68f2d688 100644
--- a/src/pcm/pcm_multi.c
+++ b/src/pcm/pcm_multi.c
@@ -762,7 +762,7 @@ static void snd_pcm_multi_dump(snd_pcm_t *pcm, snd_output_t *out)
 	}
 }
 
-static snd_pcm_ops_t snd_pcm_multi_ops = {
+static const snd_pcm_ops_t snd_pcm_multi_ops = {
 	.close = snd_pcm_multi_close,
 	.info = snd_pcm_multi_info,
 	.hw_refine = snd_pcm_multi_hw_refine,
@@ -777,7 +777,7 @@ static snd_pcm_ops_t snd_pcm_multi_ops = {
 	.munmap = snd_pcm_multi_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_multi_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_multi_fast_ops = {
 	.status = snd_pcm_multi_status,
 	.state = snd_pcm_multi_state,
 	.hwsync = snd_pcm_multi_hwsync,
diff --git a/src/pcm/pcm_null.c b/src/pcm/pcm_null.c
index 0e84f8d4..692254ae 100644
--- a/src/pcm/pcm_null.c
+++ b/src/pcm/pcm_null.c
@@ -277,7 +277,7 @@ static void snd_pcm_null_dump(snd_pcm_t *pcm, snd_output_t *out)
 	}
 }
 
-static snd_pcm_ops_t snd_pcm_null_ops = {
+static const snd_pcm_ops_t snd_pcm_null_ops = {
 	.close = snd_pcm_null_close,
 	.info = snd_pcm_null_info,
 	.hw_refine = snd_pcm_null_hw_refine,
@@ -292,7 +292,7 @@ static snd_pcm_ops_t snd_pcm_null_ops = {
 	.munmap = snd_pcm_generic_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_null_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_null_fast_ops = {
 	.status = snd_pcm_null_status,
 	.state = snd_pcm_null_state,
 	.hwsync = snd_pcm_null_hwsync,
diff --git a/src/pcm/pcm_plug.c b/src/pcm/pcm_plug.c
index b90f6ecf..abd3d437 100644
--- a/src/pcm/pcm_plug.c
+++ b/src/pcm/pcm_plug.c
@@ -1051,7 +1051,7 @@ static void snd_pcm_plug_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(plug->gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_plug_ops = {
+static const snd_pcm_ops_t snd_pcm_plug_ops = {
 	.close = snd_pcm_plug_close,
 	.info = snd_pcm_plug_info,
 	.hw_refine = snd_pcm_plug_hw_refine,
diff --git a/src/pcm/pcm_plugin.c b/src/pcm/pcm_plugin.c
index c4f5b4aa..0ef394a4 100644
--- a/src/pcm/pcm_plugin.c
+++ b/src/pcm/pcm_plugin.c
@@ -560,7 +560,7 @@ static int snd_pcm_plugin_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
 	return 0;
 }
 
-snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops = {
+const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops = {
 	.status = snd_pcm_plugin_status,
 	.state = snd_pcm_generic_state,
 	.hwsync = snd_pcm_generic_hwsync,
diff --git a/src/pcm/pcm_plugin.h b/src/pcm/pcm_plugin.h
index b427e134..dfcf6de2 100644
--- a/src/pcm/pcm_plugin.h
+++ b/src/pcm/pcm_plugin.h
@@ -63,7 +63,7 @@ typedef struct {
 
 void snd_pcm_plugin_init(snd_pcm_plugin_t *plugin);
 
-extern snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops;
+extern const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops;
 
 snd_pcm_sframes_t snd_pcm_plugin_undo_read_generic
      (snd_pcm_t *pcm,
diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
index 9cf090a5..f7b7da08 100644
--- a/src/pcm/pcm_rate.c
+++ b/src/pcm/pcm_rate.c
@@ -1195,7 +1195,7 @@ static int snd_pcm_rate_close(snd_pcm_t *pcm)
 	return snd_pcm_generic_close(pcm);
 }
 
-static snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
 	.status = snd_pcm_rate_status,
 	.state = snd_pcm_rate_state,
 	.hwsync = snd_pcm_rate_hwsync,
@@ -1221,7 +1221,7 @@ static snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
 	.poll_revents = snd_pcm_rate_poll_revents,
 };
 
-static snd_pcm_ops_t snd_pcm_rate_ops = {
+static const snd_pcm_ops_t snd_pcm_rate_ops = {
 	.close = snd_pcm_rate_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_rate_hw_refine,
diff --git a/src/pcm/pcm_rate_linear.c b/src/pcm/pcm_rate_linear.c
index a19fecbe..20e119be 100644
--- a/src/pcm/pcm_rate_linear.c
+++ b/src/pcm/pcm_rate_linear.c
@@ -405,7 +405,7 @@ static void linear_close(void *obj)
 	free(obj);
 }
 
-static snd_pcm_rate_ops_t linear_ops = {
+static const snd_pcm_rate_ops_t linear_ops = {
 	.close = linear_close,
 	.init = linear_init,
 	.free = linear_free,
diff --git a/src/pcm/pcm_route.c b/src/pcm/pcm_route.c
index 6991fb1b..34553909 100644
--- a/src/pcm/pcm_route.c
+++ b/src/pcm/pcm_route.c
@@ -747,7 +747,7 @@ static void snd_pcm_route_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(route->plug.gen.slave, out);
 }
 
-static snd_pcm_ops_t snd_pcm_route_ops = {
+static const snd_pcm_ops_t snd_pcm_route_ops = {
 	.close = snd_pcm_route_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_route_hw_refine,
diff --git a/src/pcm/pcm_share.c b/src/pcm/pcm_share.c
index 3294c716..c8a2d204 100644
--- a/src/pcm/pcm_share.c
+++ b/src/pcm/pcm_share.c
@@ -1308,7 +1308,7 @@ static void snd_pcm_share_dump(snd_pcm_t *pcm, snd_output_t *out)
 	snd_pcm_dump(slave->pcm, out);
 }
 
-static snd_pcm_ops_t snd_pcm_share_ops = {
+static const snd_pcm_ops_t snd_pcm_share_ops = {
 	.close = snd_pcm_share_close,
 	.info = snd_pcm_share_info,
 	.hw_refine = snd_pcm_share_hw_refine,
@@ -1323,7 +1323,7 @@ static snd_pcm_ops_t snd_pcm_share_ops = {
 	.munmap = snd_pcm_share_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_share_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_share_fast_ops = {
 	.status = snd_pcm_share_status,
 	.state = snd_pcm_share_state,
 	.hwsync = snd_pcm_share_hwsync,
diff --git a/src/pcm/pcm_shm.c b/src/pcm/pcm_shm.c
index b0c0bb99..69d05240 100644
--- a/src/pcm/pcm_shm.c
+++ b/src/pcm/pcm_shm.c
@@ -591,7 +591,7 @@ static void snd_pcm_shm_dump(snd_pcm_t *pcm, snd_output_t *out)
 	}
 }
 
-static snd_pcm_ops_t snd_pcm_shm_ops = {
+static const snd_pcm_ops_t snd_pcm_shm_ops = {
 	.close = snd_pcm_shm_close,
 	.info = snd_pcm_shm_info,
 	.hw_refine = snd_pcm_shm_hw_refine,
@@ -606,7 +606,7 @@ static snd_pcm_ops_t snd_pcm_shm_ops = {
 	.munmap = snd_pcm_shm_munmap,
 };
 
-static snd_pcm_fast_ops_t snd_pcm_shm_fast_ops = {
+static const snd_pcm_fast_ops_t snd_pcm_shm_fast_ops = {
 	.status = snd_pcm_shm_status,
 	.state = snd_pcm_shm_state,
 	.hwsync = snd_pcm_shm_hwsync,
diff --git a/src/pcm/pcm_softvol.c b/src/pcm/pcm_softvol.c
index d06e01b0..4c5f0f7a 100644
--- a/src/pcm/pcm_softvol.c
+++ b/src/pcm/pcm_softvol.c
@@ -739,7 +739,7 @@ static int softvol_load_control(snd_pcm_t *pcm, snd_pcm_softvol_t *svol,
 	return 0;
 }
 
-static snd_pcm_ops_t snd_pcm_softvol_ops = {
+static const snd_pcm_ops_t snd_pcm_softvol_ops = {
 	.close = snd_pcm_softvol_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_softvol_hw_refine,