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ALSA: 6fire: make buffers DMA-able (midi) 

Patch makes midi output buffer DMA-able by allocating it separately.

Signed-off-by: Torsten Schenk <torsten.schenk@zoho.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Torsten Schenk 2013-08-11 11:11:35 +02:00 committed by Takashi Iwai
parent 5ece263f1d
commit 4c2aee0032
2 changed files with 16 additions and 6 deletions
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16
sound/usb/6fire/midi.c
View File

@ -19,6 +19,10 @@
#include "chip.h"
#include "comm.h"
enum {
MIDI_BUFSIZE = 64
};
static void usb6fire_midi_out_handler(struct urb *urb)
{
struct midi_runtime *rt = urb->context;
@ -156,6 +160,12 @@ int usb6fire_midi_init(struct sfire_chip *chip)
if (!rt)
return -ENOMEM;
rt->out_buffer = kzalloc(MIDI_BUFSIZE, GFP_KERNEL);
if (!rt->out_buffer) {
kfree(rt);
return -ENOMEM;
}
rt->chip = chip;
rt->in_received = usb6fire_midi_in_received;
rt->out_buffer[0] = 0x80; /* 'send midi' command */
@ -169,6 +179,7 @@ int usb6fire_midi_init(struct sfire_chip *chip)
ret = snd_rawmidi_new(chip->card, "6FireUSB", 0, 1, 1, &rt->instance);
if (ret < 0) {
kfree(rt->out_buffer);
kfree(rt);
snd_printk(KERN_ERR PREFIX "unable to create midi.\n");
return ret;
@ -197,6 +208,9 @@ void usb6fire_midi_abort(struct sfire_chip *chip)
void usb6fire_midi_destroy(struct sfire_chip *chip)
{
kfree(chip->midi);
struct midi_runtime *rt = chip->midi;
kfree(rt->out_buffer);
kfree(rt);
chip->midi = NULL;
}

6
sound/usb/6fire/midi.h
View File

@ -16,10 +16,6 @@
#include "common.h"
enum {
MIDI_BUFSIZE = 64
};
struct midi_runtime {
struct sfire_chip *chip;
struct snd_rawmidi *instance;
@ -32,7 +28,7 @@ struct midi_runtime {
struct snd_rawmidi_substream *out;
struct urb out_urb;
u8 out_serial; /* serial number of out packet */
u8 out_buffer[MIDI_BUFSIZE];
u8 *out_buffer;
int buffer_offset;
void (*in_received)(struct midi_runtime *rt, u8 *data, int length);