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ALSA: ua101, usx2y: fix broken MIDI output

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commit e99ddfde6a upstream.

Commit 88a8516a21 (ALSA: usbaudio: implement USB autosuspend) added
autosuspend code to all files making up the snd-usb-audio driver.
However, midi.c is part of snd-usb-lib and is also used by other
drivers, not all of which support autosuspend.  Thus, calls to
usb_autopm_get_interface() could fail, and this unexpected error would
result in the MIDI output being completely unusable.

Make it work by ignoring the error that is expected with drivers that do
not support autosuspend.

Reported-by: Colin Fletcher <colin.m.fletcher@googlemail.com>
Reported-by: Devin Venable <venable.devin@gmail.com>
Reported-by: Dr Nick Bailey <nicholas.bailey@glasgow.ac.uk>
Reported-by: Jannis Achstetter <jannis_achstetter@web.de>
Reported-by: Rui Nuno Capela <rncbc@rncbc.org>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Clemens Ladisch
2012-10-31 16:35:30 +01:00
committed by Greg Kroah-Hartman
parent 14de2f67dd
commit 08dc993050
1 changed files with 6 additions and 2 deletions
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8
sound/usb/midi.c
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@@ -147,6 +147,7 @@ struct snd_usb_midi_out_endpoint {
struct snd_usb_midi_out_endpoint* ep;
struct snd_rawmidi_substream *substream;
int active;
bool autopm_reference;
uint8_t cable; /* cable number << 4 */
uint8_t state;
#define STATE_UNKNOWN 0
@@ -1059,7 +1060,8 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
return -ENXIO;
}
err = usb_autopm_get_interface(umidi->iface);
if (err < 0)
port->autopm_reference = err >= 0;
if (err < 0 && err != -EACCES)
return -EIO;
substream->runtime->private_data = port;
port->state = STATE_UNKNOWN;
@@ -1070,9 +1072,11 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct usbmidi_out_port *port = substream->runtime->private_data;
substream_open(substream, 0);
usb_autopm_put_interface(umidi->iface);
if (port->autopm_reference)
usb_autopm_put_interface(umidi->iface);
return 0;
}