1 files changed, 8 insertions, 4 deletions

diff --git a/src/modules/module-alsa-sink.c b/src/modules/module-alsa-sink.c
index 3d9f7577..f9c4efd4 100644
--- a/src/modules/module-alsa-sink.c
+++ b/src/modules/module-alsa-sink.c
@@ -174,6 +174,7 @@ static void do_write(struct userdata *u) {
     update_usage(u);
 
     for (;;) {
+        void *p;
         pa_memchunk *memchunk = NULL;
         snd_pcm_sframes_t frames;
 
@@ -185,14 +186,15 @@ static void do_write(struct userdata *u) {
             else
                 memchunk = &u->memchunk;
         }
-
         assert(memchunk->memblock);
-        assert(memchunk->memblock->data);
         assert(memchunk->length);
-        assert(memchunk->memblock->length);
         assert((memchunk->length % u->frame_size) == 0);
 
-        if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
+        p = pa_memblock_acquire(memchunk->memblock);
+
+        if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) p + memchunk->index, memchunk->length / u->frame_size)) < 0) {
+            pa_memblock_release(memchunk->memblock);
+
             if (frames == -EAGAIN)
                 return;
 
@@ -217,6 +219,8 @@ static void do_write(struct userdata *u) {
             return;
         }
 
+        pa_memblock_release(memchunk->memblock);
+
         if (memchunk == &u->memchunk) {
             size_t l = frames * u->frame_size;
             memchunk->index += l;