ALSA: usb-audio: disable autopm for MIDI devices

commit cbc200bca4b51a8e2406d4b654d978f8503d430b upstream.

Commit 88a8516a2128 (ALSA: usbaudio: implement USB autosuspend)
introduced autopm for all USB audio/MIDI devices.  However, many MIDI
devices, such as synthesizers, do not merely transmit MIDI messages but
use their MIDI inputs to control other functions.  With autopm, these
devices would get powered down as soon as the last MIDI port device is
closed on the host.

Even some plain MIDI interfaces could get broken: they automatically
send Active Sensing messages while powered up, but as soon as these
messages cease, the receiving device would interpret this as an
accidental disconnection.

Commit f5f165418cab (ALSA: usb-audio: Fix missing autopm for MIDI input)
introduced another regression: some devices (e.g. the Roland GAIA SH-01)
are self-powered but do a reset whenever the USB interface's power state
changes.

To work around all this, just disable autopm for all USB MIDI devices.

Reported-by: Laurens Holst
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 43762150bae16ad00eb3f6d8237cb49d27e53240..c635a2d6ea4b9fba94e25240d257c09d680a0c61 100644 (file)
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -125,7 +125,6 @@ struct snd_usb_midi {
                struct snd_usb_midi_in_endpoint *in;
        } endpoints[MIDI_MAX_ENDPOINTS];
        unsigned long input_triggered;
-       bool autopm_reference;
        unsigned int opened[2];
        unsigned char disconnected;
        unsigned char input_running;
@@ -1023,7 +1022,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
 {
        struct snd_usb_midi* umidi = substream->rmidi->private_data;
        struct snd_kcontrol *ctl;
-       int err;
 
        down_read(&umidi->disc_rwsem);
        if (umidi->disconnected) {
@@ -1034,13 +1032,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
        mutex_lock(&umidi->mutex);
        if (open) {
                if (!umidi->opened[0] && !umidi->opened[1]) {
-                       err = usb_autopm_get_interface(umidi->iface);
-                       umidi->autopm_reference = err >= 0;
-                       if (err < 0 && err != -EACCES) {
-                               mutex_unlock(&umidi->mutex);
-                               up_read(&umidi->disc_rwsem);
-                               return -EIO;
-                       }
                        if (umidi->roland_load_ctl) {
                                ctl = umidi->roland_load_ctl;
                                ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
@@ -1063,8 +1054,6 @@ static int substream_open(struct snd_rawmidi_substream *substream, int dir,
                                snd_ctl_notify(umidi->card,
                                       SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
                        }
-                       if (umidi->autopm_reference)
-                               usb_autopm_put_interface(umidi->iface);
                }
        }
        mutex_unlock(&umidi->mutex);
@@ -2228,6 +2217,8 @@ int snd_usbmidi_create(struct snd_card *card,
                return err;
        }
 
+       usb_autopm_get_interface_no_resume(umidi->iface);
+
        list_add_tail(&umidi->list, midi_list);
        return 0;
 }