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authorTakashi Iwai <tiwai@suse.de>2012-09-18 08:49:31 -0400
committerTakashi Iwai <tiwai@suse.de>2012-09-19 02:08:16 -0400
commit384dc085c32285e6548511bf80c5d5a5b246ed24 (patch)
tree09d8c9b74426145ff754690d19a12ec2f8991ddb /sound/usb/card.c
parent61a709504b079110cd5b12ea9a4590ffea687a5c (diff)
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 <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.c')
-rw-r--r--sound/usb/card.c2
1 files changed, 2 insertions, 0 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)
646 list_for_each(p, &chip->pcm_list) { 646 list_for_each(p, &chip->pcm_list) {
647 as = list_entry(p, struct snd_usb_stream, list); 647 as = list_entry(p, struct snd_usb_stream, list);
648 snd_pcm_suspend_all(as->pcm); 648 snd_pcm_suspend_all(as->pcm);
649 as->substream[0].need_setup_ep =
650 as->substream[1].need_setup_ep = true;
649 } 651 }
650 } 652 }
651 } else { 653 } else {