pass pa_suspend_cause_t to set_state_in_io_thread() callbacks

The suspend cause isn't yet used by any of the callbacks. The alsa sink
and source will use it to sync the mixer when the SESSION suspend cause
is removed. Currently the syncing is done in pa_sink/source_suspend(),
and I want to change that, because pa_sink/source_suspend() shouldn't
have any alsa specific code.

src/modules/alsa/alsa-sink.c

@@ -1209,12 +1209,17 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t new_stat
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SINK_SUSPENDED: {

src/modules/alsa/alsa-source.c

@@ -1064,12 +1064,17 @@ static int source_set_state_in_main_thread_cb(pa_source *s, pa_source_state_t ne
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SOURCE_SUSPENDED: {

src/modules/bluetooth/module-bluez4-device.c

@@ -413,7 +413,7 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
@@ -487,7 +487,7 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/bluetooth/module-bluez5-device.c

@@ -915,7 +915,7 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
@@ -1092,7 +1092,7 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/echo-cancel/module-echo-cancel.c

@@ -514,7 +514,7 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t state, p
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-combine-sink.c

@@ -719,13 +719,18 @@ static int sink_set_state_in_main_thread_cb(pa_sink *sink, pa_sink_state_t state
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
     bool running;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     running = new_state == PA_SINK_RUNNING;
     pa_atomic_store(&u->thread_info.running, running);
 

src/modules/module-equalizer-sink.c

@@ -288,7 +288,7 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t state, p
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-esound-sink.c

@@ -169,12 +169,17 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SINK_SUSPENDED:

src/modules/module-ladspa-sink.c

@@ -395,7 +395,7 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t state, p
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-null-sink.c

@@ -103,7 +103,7 @@ static int sink_process_msg(
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-null-source.c

@@ -103,7 +103,7 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-pipe-sink.c

@@ -136,7 +136,7 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-remap-sink.c

@@ -115,7 +115,7 @@ static int sink_set_state_in_main_thread(pa_sink *s, pa_sink_state_t state, pa_s
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-sine-source.c

@@ -103,7 +103,7 @@ static int source_process_msg(
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-solaris.c

@@ -396,12 +396,17 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SINK_SUSPENDED:
@@ -457,12 +462,17 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SOURCE_SUSPENDED:

src/modules/module-tunnel-sink-new.c

@@ -434,12 +434,17 @@ static int sink_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t of
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     if (!u->stream || pa_stream_get_state(u->stream) != PA_STREAM_READY)
         return 0;
 

src/modules/module-tunnel-source-new.c

@@ -433,12 +433,17 @@ static int source_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     if (!u->stream || pa_stream_get_state(u->stream) != PA_STREAM_READY)
         return 0;
 

src/modules/module-virtual-sink.c

@@ -127,7 +127,7 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t state, p
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/module-virtual-surround-sink.c

@@ -155,7 +155,7 @@ static int sink_set_state_in_main_thread_cb(pa_sink *s, pa_sink_state_t state, p
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);

src/modules/oss/module-oss.c

@@ -666,7 +666,7 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
     bool do_trigger = false;
     bool quick = true;
@@ -674,6 +674,11 @@ static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state)
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SINK_SUSPENDED:
@@ -749,7 +754,7 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 }
 
 /* Called from the IO thread. */
-static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state) {
+static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
     bool do_trigger = false;
     bool quick = true;
@@ -757,6 +762,11 @@ static int source_set_state_in_io_thread_cb(pa_source *s, pa_source_state_t new_
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
 
         case PA_SOURCE_SUSPENDED:

src/modules/raop/raop-sink.c

@@ -221,12 +221,17 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 }
 
 /* Called from the IO thread. */
-static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state) {
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
     struct userdata *u;
 
     pa_assert(s);
     pa_assert_se(u = s->userdata);
 
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
     switch (new_state) {
         case PA_SINK_SUSPENDED:
             pa_log_debug("RAOP: SUSPENDED");

src/pulsecore/sink.c

@@ -69,6 +69,11 @@ struct sink_message_set_port {
     int ret;
 };
 
+struct set_state_data {
+    pa_sink_state_t state;
+    pa_suspend_cause_t suspend_cause;
+};
+
 static void sink_free(pa_object *s);
 
 static void pa_sink_volume_change_push(pa_sink *s);
@@ -429,19 +434,49 @@ static int sink_set_state(pa_sink *s, pa_sink_state_t state, pa_suspend_cause_t
      * current approach of not setting any suspend cause works well enough. */
 
     if (s->set_state_in_main_thread) {
-        ret = s->set_state_in_main_thread(s, state, suspend_cause);
-        /* set_state_in_main_thread() is allowed to fail only when resuming. */
-        pa_assert(ret >= 0 || resuming);
+        if ((ret = s->set_state_in_main_thread(s, state, suspend_cause)) < 0) {
+            /* set_state_in_main_thread() is allowed to fail only when resuming. */
+            pa_assert(resuming);
+
+            /* If resuming fails, we set the state to SUSPENDED and
+             * suspend_cause to 0. */
+            state = PA_SINK_SUSPENDED;
+            suspend_cause = 0;
+            state_changed = false;
+            suspend_cause_changed = suspend_cause != s->suspend_cause;
+            resuming = false;
+
+            /* We know the state isn't changing. If the suspend cause isn't
+             * changing either, then there's nothing more to do. */
+            if (!suspend_cause_changed)
+                return ret;
+        }
     }
 
-    if (ret >= 0 && s->asyncmsgq && state_changed)
-        if ((ret = pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL)) < 0) {
+    if (s->asyncmsgq) {
+        struct set_state_data data = { .state = state, .suspend_cause = suspend_cause };
+
+        if ((ret = pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_STATE, &data, 0, NULL)) < 0) {
             /* SET_STATE is allowed to fail only when resuming. */
             pa_assert(resuming);
 
             if (s->set_state_in_main_thread)
                 s->set_state_in_main_thread(s, PA_SINK_SUSPENDED, 0);
+
+            /* If resuming fails, we set the state to SUSPENDED and
+             * suspend_cause to 0. */
+            state = PA_SINK_SUSPENDED;
+            suspend_cause = 0;
+            state_changed = false;
+            suspend_cause_changed = suspend_cause != s->suspend_cause;
+            resuming = false;
+
+            /* We know the state isn't changing. If the suspend cause isn't
+             * changing either, then there's nothing more to do. */
+            if (!suspend_cause_changed)
+                return ret;
         }
+    }
 
     if (suspend_cause_changed) {
         char old_cause_buf[PA_SUSPEND_CAUSE_TO_STRING_BUF_SIZE];
@@ -452,9 +487,6 @@ static int sink_set_state(pa_sink *s, pa_sink_state_t state, pa_suspend_cause_t
         s->suspend_cause = suspend_cause;
     }
 
-    if (ret < 0)
-        goto finish;
-
     if (state_changed) {
         pa_log_debug("%s: state: %s -> %s", s->name, pa_sink_state_to_string(s->state), pa_sink_state_to_string(state));
         s->state = state;
@@ -481,7 +513,6 @@ static int sink_set_state(pa_sink *s, pa_sink_state_t state, pa_suspend_cause_t
                 i->suspend(i, state == PA_SINK_SUSPENDED);
     }
 
-finish:
     if ((suspending || resuming || suspend_cause_changed) && s->monitor_source && state != PA_SINK_UNLINKED)
         pa_source_sync_suspend(s->monitor_source);
 
@@ -2846,19 +2877,19 @@ int pa_sink_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offse
             return 0;
 
         case PA_SINK_MESSAGE_SET_STATE: {
-
+            struct set_state_data *data = userdata;
             bool suspend_change =
-                (s->thread_info.state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(PA_PTR_TO_UINT(userdata))) ||
-                (PA_SINK_IS_OPENED(s->thread_info.state) && PA_PTR_TO_UINT(userdata) == PA_SINK_SUSPENDED);
+                (s->thread_info.state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(data->state)) ||
+                (PA_SINK_IS_OPENED(s->thread_info.state) && data->state == PA_SINK_SUSPENDED);
 
             if (s->set_state_in_io_thread) {
                 int r;
 
-                if ((r = s->set_state_in_io_thread(s, PA_PTR_TO_UINT(userdata))) < 0)
+                if ((r = s->set_state_in_io_thread(s, data->state, data->suspend_cause)) < 0)
                     return r;
             }
 
-            s->thread_info.state = PA_PTR_TO_UINT(userdata);
+            s->thread_info.state = data->state;
 
             if (s->thread_info.state == PA_SINK_SUSPENDED) {
                 s->thread_info.rewind_nbytes = 0;

src/pulsecore/sink.h

@@ -148,7 +148,7 @@ struct pa_sink {
      * are updated only after all the callback calls. In case of failure, the
      * state is set to SUSPENDED and the suspend cause is set to 0. */
     int (*set_state_in_main_thread)(pa_sink *s, pa_sink_state_t state, pa_suspend_cause_t suspend_cause); /* may be NULL */
-    int (*set_state_in_io_thread)(pa_sink *s, pa_sink_state_t state); /* may be NULL */
+    int (*set_state_in_io_thread)(pa_sink *s, pa_sink_state_t state, pa_suspend_cause_t suspend_cause); /* may be NULL */
 
     /* Sink drivers that support hardware volume may set this
      * callback. This is called when the current volume needs to be

src/pulsecore/source.c

@@ -61,6 +61,11 @@ struct source_message_set_port {
     int ret;
 };
 
+struct set_state_data {
+    pa_source_state_t state;
+    pa_suspend_cause_t suspend_cause;
+};
+
 static void source_free(pa_object *o);
 
 static void pa_source_volume_change_push(pa_source *s);
@@ -383,19 +388,49 @@ static int source_set_state(pa_source *s, pa_source_state_t state, pa_suspend_ca
      * current approach of not setting any suspend cause works well enough. */
 
     if (s->set_state_in_main_thread) {
-        ret = s->set_state_in_main_thread(s, state, suspend_cause);
-        /* set_state_in_main_thread() is allowed to fail only when resuming. */
-        pa_assert(ret >= 0 || resuming);
+        if ((ret = s->set_state_in_main_thread(s, state, suspend_cause)) < 0) {
+            /* set_state_in_main_thread() is allowed to fail only when resuming. */
+            pa_assert(resuming);
+
+            /* If resuming fails, we set the state to SUSPENDED and
+             * suspend_cause to 0. */
+            state = PA_SOURCE_SUSPENDED;
+            suspend_cause = 0;
+            state_changed = false;
+            suspend_cause_changed = suspend_cause != s->suspend_cause;
+            resuming = false;
+
+            /* We know the state isn't changing. If the suspend cause isn't
+             * changing either, then there's nothing more to do. */
+            if (!suspend_cause_changed)
+                return ret;
+        }
     }
 
-    if (ret >= 0 && s->asyncmsgq && state_changed)
-        if ((ret = pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SOURCE_MESSAGE_SET_STATE, PA_UINT_TO_PTR(state), 0, NULL)) < 0) {
+    if (s->asyncmsgq) {
+        struct set_state_data data = { .state = state, .suspend_cause = suspend_cause };
+
+        if ((ret = pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SOURCE_MESSAGE_SET_STATE, &data, 0, NULL)) < 0) {
             /* SET_STATE is allowed to fail only when resuming. */
             pa_assert(resuming);
 
             if (s->set_state_in_main_thread)
                 s->set_state_in_main_thread(s, PA_SOURCE_SUSPENDED, 0);
+
+            /* If resuming fails, we set the state to SUSPENDED and
+             * suspend_cause to 0. */
+            state = PA_SOURCE_SUSPENDED;
+            suspend_cause = 0;
+            state_changed = false;
+            suspend_cause_changed = suspend_cause != s->suspend_cause;
+            resuming = false;
+
+            /* We know the state isn't changing. If the suspend cause isn't
+             * changing either, then there's nothing more to do. */
+            if (!suspend_cause_changed)
+                return ret;
         }
+    }
 
     if (suspend_cause_changed) {
         char old_cause_buf[PA_SUSPEND_CAUSE_TO_STRING_BUF_SIZE];
@@ -406,9 +441,6 @@ static int source_set_state(pa_source *s, pa_source_state_t state, pa_suspend_ca
         s->suspend_cause = suspend_cause;
     }
 
-    if (ret < 0)
-        goto finish;
-
     if (state_changed) {
         pa_log_debug("%s: state: %s -> %s", s->name, pa_source_state_to_string(s->state), pa_source_state_to_string(state));
         s->state = state;
@@ -435,7 +467,6 @@ static int source_set_state(pa_source *s, pa_source_state_t state, pa_suspend_ca
                 o->suspend(o, state == PA_SOURCE_SUSPENDED);
     }
 
-finish:
     return ret;
 }
 
@@ -2220,19 +2251,19 @@ int pa_source_process_msg(pa_msgobject *object, int code, void *userdata, int64_
             return 0;
 
         case PA_SOURCE_MESSAGE_SET_STATE: {
-
+            struct set_state_data *data = userdata;
             bool suspend_change =
-                (s->thread_info.state == PA_SOURCE_SUSPENDED && PA_SOURCE_IS_OPENED(PA_PTR_TO_UINT(userdata))) ||
-                (PA_SOURCE_IS_OPENED(s->thread_info.state) && PA_PTR_TO_UINT(userdata) == PA_SOURCE_SUSPENDED);
+                (s->thread_info.state == PA_SOURCE_SUSPENDED && PA_SOURCE_IS_OPENED(data->state)) ||
+                (PA_SOURCE_IS_OPENED(s->thread_info.state) && data->state == PA_SOURCE_SUSPENDED);
 
             if (s->set_state_in_io_thread) {
                 int r;
 
-                if ((r = s->set_state_in_io_thread(s, PA_PTR_TO_UINT(userdata))) < 0)
+                if ((r = s->set_state_in_io_thread(s, data->state, data->suspend_cause)) < 0)
                     return r;
             }
 
-            s->thread_info.state = PA_PTR_TO_UINT(userdata);
+            s->thread_info.state = data->state;
 
             if (suspend_change) {
                 pa_source_output *o;

src/pulsecore/source.h

@@ -149,7 +149,7 @@ struct pa_source {
      * are updated only after all the callback calls. In case of failure, the
      * state is set to SUSPENDED and the suspend cause is set to 0. */
     int (*set_state_in_main_thread)(pa_source *s, pa_source_state_t state, pa_suspend_cause_t suspend_cause); /* may be NULL */
-    int (*set_state_in_io_thread)(pa_source *s, pa_source_state_t state); /* may be NULL */
+    int (*set_state_in_io_thread)(pa_source *s, pa_source_state_t state, pa_suspend_cause_t suspend_cause); /* may be NULL */
 
     /* Called when the volume is queried. Called from main loop
      * context. If this is NULL a PA_SOURCE_MESSAGE_GET_VOLUME message