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Old 03-09-2009, 03:26 AM
dann frazier
 
Default Bug#518900: ALSA: caiaq - Fix Oops with MIDI

Package: linux-2.6
Version: 2.6.26-13
Severity: important
Tags: patch

Requested by Moritz Muehlenhoff:

commit f3f80a9205da74fa56d613f4c14b88b6e4e6caa8
Author: Takashi Iwai <tiwai@suse.de>
Date: Thu Jan 8 15:32:56 2009 +0100

ALSA: caiaq - Fix Oops with MIDI

The snd-usb-caiaq driver causes Oops occasionally when accessing MIDI
devices. This patch fixes the Oops and invalid URB submission errors
as well.

Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/caiaq/caiaq-device.h b/sound/usb/caiaq/caiaq-device.h
index f9fbdba..ab56e73 100644
--- a/sound/usb/caiaq/caiaq-device.h
+++ b/sound/usb/caiaq/caiaq-device.h
@@ -75,6 +75,7 @@ struct snd_usb_caiaqdev {
wait_queue_head_t ep1_wait_queue;
wait_queue_head_t prepare_wait_queue;
int spec_received, audio_parm_answer;
+ int midi_out_active;

char vendor_name[CAIAQ_USB_STR_LEN];
char product_name[CAIAQ_USB_STR_LEN];
diff --git a/sound/usb/caiaq/caiaq-midi.c b/sound/usb/caiaq/caiaq-midi.c
index 30b57f9..f19fd36 100644
--- a/sound/usb/caiaq/caiaq-midi.c
+++ b/sound/usb/caiaq/caiaq-midi.c
@@ -59,6 +59,11 @@ static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substrea

static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
{
+ struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
+ if (dev->midi_out_active) {
+ usb_kill_urb(&dev->midi_out_urb);
+ dev->midi_out_active = 0;
+ }
return 0;
}

@@ -69,7 +74,8 @@ static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,

dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
dev->midi_out_buf[1] = 0; /* port */
- len = snd_rawmidi_transmit_peek(substream, dev->midi_out_buf+3, EP1_BUFSIZE-3);
+ len = snd_rawmidi_transmit(substream, dev->midi_out_buf + 3,
+ EP1_BUFSIZE - 3);

if (len <= 0)
return;
@@ -79,24 +85,24 @@ static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,

ret = usb_submit_urb(&dev->midi_out_urb, GFP_ATOMIC);
if (ret < 0)
- log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed, %d
",
- substream, ret);
+ log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
+ "ret=%d, len=%d
",
+ substream, ret, len);
+ else
+ dev->midi_out_active = 1;
}

static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;

- if (dev->midi_out_substream != NULL)
- return;
-
- if (!up) {
+ if (up) {
+ dev->midi_out_substream = substream;
+ if (!dev->midi_out_active)
+ snd_usb_caiaq_midi_send(dev, substream);
+ } else {
dev->midi_out_substream = NULL;
- return;
}
-
- dev->midi_out_substream = substream;
- snd_usb_caiaq_midi_send(dev, substream);
}


@@ -161,16 +167,14 @@ int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
void snd_usb_caiaq_midi_output_done(struct urb* urb)
{
struct snd_usb_caiaqdev *dev = urb->context;
- char *buf = urb->transfer_buffer;

+ dev->midi_out_active = 0;
if (urb->status != 0)
return;

if (!dev->midi_out_substream)
return;

- snd_rawmidi_transmit_ack(dev->midi_out_substream, buf[2]);
- dev->midi_out_substream = NULL;
snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);
}




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