ALSA: usb-audio: Avoid unnecessary EP setups in prepare
authorTakashi Iwai <tiwai@suse.de>
Tue, 18 Sep 2012 12:49:31 +0000 (14:49 +0200)
committerTakashi Iwai <tiwai@suse.de>
Wed, 19 Sep 2012 06:08:16 +0000 (08:08 +0200)
commit384dc085c32285e6548511bf80c5d5a5b246ed24
tree09d8c9b74426145ff754690d19a12ec2f8991ddb
parent61a709504b079110cd5b12ea9a4590ffea687a5c
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>
sound/usb/card.c
sound/usb/card.h
sound/usb/pcm.c