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-rw-r--r--sound/usb/midi.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index db2dc5ffe6dd..b4b39c0b6c9e 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -54,6 +54,7 @@
#include <sound/asequencer.h>
#include "usbaudio.h"
#include "midi.h"
+#include "power.h"
#include "helper.h"
/*
@@ -1044,6 +1045,7 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct usbmidi_out_port* port = NULL;
int i, j;
+ int err;
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
if (umidi->endpoints[i].out)
@@ -1056,6 +1058,9 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
snd_BUG();
return -ENXIO;
}
+ err = usb_autopm_get_interface(umidi->iface);
+ if (err < 0)
+ return -EIO;
substream->runtime->private_data = port;
port->state = STATE_UNKNOWN;
substream_open(substream, 1);
@@ -1064,7 +1069,10 @@ 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;
+
substream_open(substream, 0);
+ usb_autopm_put_interface(umidi->iface);
return 0;
}