The patch
ASoC: dapm: Simplify list creation in dapm_dai_get_connected_widgets()
has been applied to the asoc tree at
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 1ce43acff0c078fd560ee0f2a4ae10b8da28e388 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen lars@metafoo.de Date: Sun, 26 Jul 2015 19:04:59 +0200 Subject: [PATCH] ASoC: dapm: Simplify list creation in dapm_dai_get_connected_widgets()
When running dapm_dai_get_connected_widgets() currently in is_connected_{input,output}_ep() for each widget that gets added the array is resized and the code also loops over all existing entries to avoid adding a widget multiple times.
The former can be avoided by collecting the widgets in a linked list and only once we have all widgets allocate the array.
The later can be avoided by changing when the widget is added. Currently it is added when walking the neighbor lists of a widget. Since a widget can be neighbors with multiple other widgets it could get added twice and hence the check is necessary. But the main body of is_connected_{input,output}_ep is guaranteed to be only executed at most once per widget. So adding the widget to the list at the beginning of the function automatically makes sure that each widget gets only added once. The only difference is that using this method the starting point itself will also end up on the list, but it can easily be skipped when creating the array.
Overall this reduces the code size and speeds things slightly up.
Signed-off-by: Lars-Peter Clausen lars@metafoo.de Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/soc-dapm.c | 101 ++++++++++++++++++--------------------------------- sound/soc/soc-pcm.c | 11 +----- 2 files changed, 38 insertions(+), 74 deletions(-)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index f80b7de..4586f95 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1032,43 +1032,27 @@ static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget) } }
-/* add widget to list if it's not already in the list */ -static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list, - struct snd_soc_dapm_widget *w) +static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list, + struct list_head *widgets) { - struct snd_soc_dapm_widget_list *wlist; - int wlistsize, wlistentries, i; - - if (*list == NULL) - return -EINVAL; - - wlist = *list; + struct snd_soc_dapm_widget *w; + struct list_head *it; + unsigned int size = 0; + unsigned int i = 0;
- /* is this widget already in the list */ - for (i = 0; i < wlist->num_widgets; i++) { - if (wlist->widgets[i] == w) - return 0; - } + list_for_each(it, widgets) + size++;
- /* allocate some new space */ - wlistentries = wlist->num_widgets + 1; - wlistsize = sizeof(struct snd_soc_dapm_widget_list) + - wlistentries * sizeof(struct snd_soc_dapm_widget *); - *list = krealloc(wlist, wlistsize, GFP_KERNEL); - if (*list == NULL) { - dev_err(w->dapm->dev, "ASoC: can't allocate widget list for %s\n", - w->name); + *list = kzalloc(sizeof(**list) + size * sizeof(*w), GFP_KERNEL); + if (*list == NULL) return -ENOMEM; - } - wlist = *list;
- /* insert the widget */ - dev_dbg(w->dapm->dev, "ASoC: added %s in widget list pos %d\n", - w->name, wlist->num_widgets); + list_for_each_entry(w, widgets, work_list) + (*list)->widgets[i++] = w;
- wlist->widgets[wlist->num_widgets] = w; - wlist->num_widgets++; - return 1; + (*list)->num_widgets = i; + + return 0; }
/* @@ -1076,7 +1060,7 @@ static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list, * output widget. Returns number of complete paths. */ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, - struct snd_soc_dapm_widget_list **list) + struct list_head *list) { struct snd_soc_dapm_path *path; int con = 0; @@ -1086,6 +1070,10 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
DAPM_UPDATE_STAT(widget, path_checks);
+ /* do we need to add this widget to the list ? */ + if (list) + list_add_tail(&widget->work_list, list); + if (widget->is_sink && widget->connected) { widget->outputs = snd_soc_dapm_suspend_check(widget); return widget->outputs; @@ -1104,22 +1092,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
if (path->connect) { path->walking = 1; - - /* do we need to add this widget to the list ? */ - if (list) { - int err; - err = dapm_list_add_widget(list, path->sink); - if (err < 0) { - dev_err(widget->dapm->dev, - "ASoC: could not add widget %s\n", - widget->name); - path->walking = 0; - return con; - } - } - con += is_connected_output_ep(path->sink, list); - path->walking = 0; } } @@ -1134,7 +1107,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, * input widget. Returns number of complete paths. */ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget, - struct snd_soc_dapm_widget_list **list) + struct list_head *list) { struct snd_soc_dapm_path *path; int con = 0; @@ -1144,6 +1117,10 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
DAPM_UPDATE_STAT(widget, path_checks);
+ /* do we need to add this widget to the list ? */ + if (list) + list_add_tail(&widget->work_list, list); + if (widget->is_source && widget->connected) { widget->inputs = snd_soc_dapm_suspend_check(widget); return widget->inputs; @@ -1162,22 +1139,7 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
if (path->connect) { path->walking = 1; - - /* do we need to add this widget to the list ? */ - if (list) { - int err; - err = dapm_list_add_widget(list, path->source); - if (err < 0) { - dev_err(widget->dapm->dev, - "ASoC: could not add widget %s\n", - widget->name); - path->walking = 0; - return con; - } - } - con += is_connected_input_ep(path->source, list); - path->walking = 0; } } @@ -1204,7 +1166,9 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream, { struct snd_soc_card *card = dai->component->card; struct snd_soc_dapm_widget *w; + LIST_HEAD(widgets); int paths; + int ret;
mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
@@ -1218,9 +1182,16 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream, }
if (stream == SNDRV_PCM_STREAM_PLAYBACK) - paths = is_connected_output_ep(dai->playback_widget, list); + paths = is_connected_output_ep(dai->playback_widget, &widgets); else - paths = is_connected_input_ep(dai->capture_widget, list); + paths = is_connected_input_ep(dai->capture_widget, &widgets); + + /* Drop starting point */ + list_del(widgets.next); + + ret = dapm_widget_list_create(list, &widgets); + if (ret) + return ret;
trace_snd_soc_dapm_connected(paths, stream); mutex_unlock(&card->dapm_mutex); diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 256b9c9..7aed170 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -1231,24 +1231,17 @@ static int widget_in_list(struct snd_soc_dapm_widget_list *list, }
int dpcm_path_get(struct snd_soc_pcm_runtime *fe, - int stream, struct snd_soc_dapm_widget_list **list_) + int stream, struct snd_soc_dapm_widget_list **list) { struct snd_soc_dai *cpu_dai = fe->cpu_dai; - struct snd_soc_dapm_widget_list *list; int paths;
- list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) + - sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL); - if (list == NULL) - return -ENOMEM; - /* get number of valid DAI paths and their widgets */ - paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list); + paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list);
dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths, stream ? "capture" : "playback");
- *list_ = list; return paths; }