This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: disable autopm for MIDI devices
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-audio-disable-autopm-for-midi-devices.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cbc200bca4b51a8e2406d4b654d978f8503d430b Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@xxxxxxxxxx>
Date: Mon, 15 Apr 2013 15:59:51 +0200
Subject: ALSA: usb-audio: disable autopm for MIDI devices
From: Clemens Ladisch <clemens@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/midi.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
--- 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_raw
{
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_raw
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_raw
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 *
return err;
}
+ usb_autopm_get_interface_no_resume(umidi->iface);
+
list_add_tail(&umidi->list, midi_list);
return 0;
}
Patches currently in stable-queue which might be from clemens@xxxxxxxxxx are
queue-3.0/alsa-usb-audio-disable-autopm-for-midi-devices.patch
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