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fix a call to pa_sink_suspend() from an incorrect thread

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The alsa sink calls pa_sink_suspend() from the set_port() callback.
pa_sink_suspend() can only be called from the main thread, but the
set_port() callback was often called from the IO thread. That caused an
assertion to be hit in pa_sink_suspend() when switching ports.

Another issue was that pa_sink_suspend() called the set_port() callback,
and if the callback calls pa_sink_suspend() again recursively, nothing
good can be expected from that, so the thread mismatch was not the only
problem.

This patch moves the mixer syncing logic out of pa_sink/source_suspend()
to be handled internally by the alsa sink/source. This removes the
recursive pa_sink_suspend() call. This also removes the need to have the
mixer_dirty flag in pa_sink/source, so the flag and the
pa_sink/source_set_mixer_dirty() functions can be removed.

This patch also changes the threading rules of set_port(). Previously it
was called sometimes from the main thread and sometimes from the IO
thread. Now it's always called from the main thread. When deferred
volumes are used, the alsa sink and source still have to update the
mixer from the IO thread when switching ports, but the thread
synchronization is now handled internally by the alsa sink and source.
The SET_PORT messages are not needed any more and can be removed.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=104761
This commit is contained in:
Tanu Kaskinen 2018-03-19 23:11:05 +02:00
parent ad0616d4c9
commit ad15e6e50e
6 changed files with 156 additions and 150 deletions
Download patch file Download diff file Expand all files Collapse all files

94
src/modules/alsa/alsa-source.c
View file

@ -143,6 +143,10 @@ struct userdata {
pa_alsa_ucm_mapping_context *ucm_context;
};
enum {
SOURCE_MESSAGE_SYNC_MIXER = PA_SOURCE_MESSAGE_MAX
};
static void userdata_free(struct userdata *u);
static pa_hook_result_t reserve_cb(pa_reserve_wrapper *r, void *forced, struct userdata *u) {
@ -1023,6 +1027,43 @@ fail:
return -PA_ERR_IO;
}
/* Called from the IO thread or the main thread depending on whether deferred
* volume is enabled or not (with deferred volume all mixer handling is done
* from the IO thread).
*
* Sets the mixer settings to match the current source and port state (the port
* is given as an argument, because active_port may still point to the old
* port, if we're switching ports). */
static void sync_mixer(struct userdata *u, pa_device_port *port) {
pa_alsa_setting *setting = NULL;
pa_assert(u);
if (!u->mixer_path)
return;
/* port may be NULL, because if we use a synthesized mixer path, then the
* source has no ports. */
if (port) {
pa_alsa_port_data *data;
data = PA_DEVICE_PORT_DATA(port);
setting = data->setting;
}
pa_alsa_path_select(u->mixer_path, setting, u->mixer_handle, u->source->muted);
if (u->source->set_mute)
u->source->set_mute(u->source);
if (u->source->flags & PA_SOURCE_DEFERRED_VOLUME) {
if (u->source->write_volume)
u->source->write_volume(u->source);
} else {
if (u->source->set_volume)
u->source->set_volume(u->source);
}
}
/* Called from IO context */
static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
struct userdata *u = PA_SOURCE(o)->userdata;
@ -1039,6 +1080,13 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
return 0;
}
case SOURCE_MESSAGE_SYNC_MIXER: {
pa_device_port *port = data;
sync_mixer(u, port);
return 0;
}
}
return pa_source_process_msg(o, code, data, offset, chunk);
@ -1052,6 +1100,16 @@ static int source_set_state_in_main_thread_cb(pa_source *s, pa_source_state_t ne
pa_source_assert_ref(s);
pa_assert_se(u = s->userdata);
/* When our session becomes active, we need to sync the mixer, because
* another user may have changed the mixer settings.
*
* If deferred volume is enabled, the syncing is done in the
* set_state_in_io_thread() callback instead. */
if (!(s->flags & PA_SOURCE_DEFERRED_VOLUME)
&& (s->suspend_cause & PA_SUSPEND_SESSION)
&& !(new_suspend_cause & PA_SUSPEND_SESSION))
sync_mixer(u, s->active_port);
old_state = pa_source_get_state(u->source);
if (PA_SOURCE_IS_OPENED(old_state) && new_state == PA_SOURCE_SUSPENDED)
@ -1070,8 +1128,18 @@ 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);
/* When our session becomes active, we need to sync the mixer, because
* another user may have changed the mixer settings.
*
* If deferred volume is disabled, the syncing is done in the
* set_state_in_main_thread() callback instead. */
if ((s->flags & PA_SOURCE_DEFERRED_VOLUME)
&& (s->suspend_cause & PA_SUSPEND_SESSION)
&& !(new_suspend_cause & PA_SUSPEND_SESSION))
sync_mixer(u, s->active_port);
/* It may be that only the suspend cause is changing, in which case there's
* nothing to do. */
* nothing more to do. */
if (new_state == s->thread_info.state)
return 0;
@ -1128,10 +1196,8 @@ static int ctl_mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
if (!PA_SOURCE_IS_LINKED(u->source->state))
return 0;
if (u->source->suspend_cause & PA_SUSPEND_SESSION) {
pa_source_set_mixer_dirty(u->source, true);
if (u->source->suspend_cause & PA_SUSPEND_SESSION)
return 0;
}
if (mask & SND_CTL_EVENT_MASK_VALUE) {
pa_source_get_volume(u->source, true);
@ -1150,10 +1216,8 @@ static int io_mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
if (mask == SND_CTL_EVENT_MASK_REMOVE)
return 0;
if (u->source->suspend_cause & PA_SUSPEND_SESSION) {
pa_source_set_mixer_dirty(u->source, true);
if (u->source->suspend_cause & PA_SUSPEND_SESSION)
return 0;
}
if (mask & SND_CTL_EVENT_MASK_VALUE)
pa_source_update_volume_and_mute(u->source);
@ -1377,21 +1441,13 @@ static int source_set_port_cb(pa_source *s, pa_device_port *p) {
pa_assert(u->mixer_handle);
data = PA_DEVICE_PORT_DATA(p);
pa_assert_se(u->mixer_path = data->path);
pa_alsa_path_select(u->mixer_path, data->setting, u->mixer_handle, s->muted);
mixer_volume_init(u);
if (s->set_mute)
s->set_mute(s);
if (s->flags & PA_SOURCE_DEFERRED_VOLUME) {
if (s->write_volume)
s->write_volume(s);
} else {
if (s->set_volume)
s->set_volume(s);
}
if (s->flags & PA_SOURCE_DEFERRED_VOLUME)
pa_asyncmsgq_send(u->source->asyncmsgq, PA_MSGOBJECT(u->source), SOURCE_MESSAGE_SYNC_MIXER, p, 0, NULL);
else
sync_mixer(u, p);
return 0;
}