From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 3 Dec 2012 10:30:50 +0000 (+0100)
Subject: ALSA: usb-audio: Fix missing autopm for MIDI input
X-Git-Tag: v3.2.36~69
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8663878ce65e8bdaf0cd4925147c43dc33c5290;p=pandora-kernel.git

ALSA: usb-audio: Fix missing autopm for MIDI input

commit f5f165418cabf2218eb466c0e94693b8b1aee88b upstream.

The commit [88a8516a: ALSA: usbaudio: implement USB autosuspend] added
the support of autopm for USB MIDI output, but it didn't take the MIDI
input into account.

This patch adds the following for fixing the autopm:
- Manage the URB start at the first MIDI input stream open, instead of
  the time of instance creation
- Move autopm code to the common substream_open()
- Make snd_usbmidi_input_start/_stop() more robust and add the running
  state check

Reviewd-by: Clemens Ladisch <clemens@ladisch.de>
Tested-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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