From 384dc085c32285e6548511bf80c5d5a5b246ed24 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 18 Sep 2012 14:49:31 +0200 Subject: [PATCH] ALSA: usb-audio: Avoid unnecessary EP setups in prepare The recent fix for USB suspend breakage moved the code to set up EP from hw_params to prepare, but it means also the EP setup might be called multiple times unnecessarily because the prepare callback can be called multiple times without starting the stream (e.g. OSS emulation). This patch adds a new flag to struct snd_usb_substream indicating whether the setup of EP is required, and do it only when necessary, i.e. right after hw_params or suspend. Signed-off-by: Takashi Iwai --- sound/usb/card.c | 2 ++ sound/usb/card.h | 1 + sound/usb/pcm.c | 10 +++++++--- 3 files changed, 10 insertions(+), 3 deletions(-) diff --git a/sound/usb/card.c b/sound/usb/card.c index 4a469f0cb6d4..561bb74fd364 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -646,6 +646,8 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) list_for_each(p, &chip->pcm_list) { as = list_entry(p, struct snd_usb_stream, list); snd_pcm_suspend_all(as->pcm); + as->substream[0].need_setup_ep = + as->substream[1].need_setup_ep = true; } } } else { diff --git a/sound/usb/card.h b/sound/usb/card.h index 6cc883c3567d..afa4f9e9b27a 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -125,6 +125,7 @@ struct snd_usb_substream { struct snd_usb_endpoint *data_endpoint; struct snd_usb_endpoint *sync_endpoint; unsigned long flags; + bool need_setup_ep; /* (re)configure EP at prepare? */ u64 formats; /* format bitmasks (all or'ed) */ unsigned int num_formats; /* number of supported audio formats (list) */ diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index ae783d40f55a..55e19e1b80ec 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -510,6 +510,7 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream, subs->interface = fmt->iface; subs->altset_idx = fmt->altset_idx; + subs->need_setup_ep = true; return 0; } @@ -568,9 +569,12 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) if (ret < 0) return ret; - ret = configure_endpoint(subs); - if (ret < 0) - return ret; + if (subs->need_setup_ep) { + ret = configure_endpoint(subs); + if (ret < 0) + return ret; + subs->need_setup_ep = false; + } /* some unit conversions in runtime */ subs->data_endpoint->maxframesize = -- 2.34.1