ALSA: line6: Reduce superfluous spinlock in midi.c
The midi_transmit_lock is used always inside the send_urb_lock, thus
it doesn't play any role. Let's kill it. Also, rename
"send_urb_lock" as a more simple name "lock" since this is the only
lock for midi.
Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/line6/midi.c b/sound/usb/line6/midi.c
index b5a58a7..beeedf9 100644
--- a/sound/usb/line6/midi.c
+++ b/sound/usb/line6/midi.c
@@ -45,12 +45,9 @@
line6_rawmidi_substream_midi(substream)->line6;
struct snd_line6_midi *line6midi = line6->line6midi;
struct midi_buffer *mb = &line6midi->midibuf_out;
- unsigned long flags;
unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
int req, done;
- spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags);
-
for (;;) {
req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
done = snd_rawmidi_transmit_peek(substream, chunk, req);
@@ -71,8 +68,6 @@
send_midi_async(line6, chunk, done);
}
-
- spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
}
/*
@@ -92,7 +87,7 @@
if (status == -ESHUTDOWN)
return;
- spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
+ spin_lock_irqsave(&line6->line6midi->lock, flags);
num = --line6->line6midi->num_active_send_urbs;
if (num == 0) {
@@ -103,12 +98,12 @@
if (num == 0)
wake_up(&line6->line6midi->send_wait);
- spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
+ spin_unlock_irqrestore(&line6->line6midi->lock, flags);
}
/*
Send an asynchronous MIDI message.
- Assumes that line6->line6midi->send_urb_lock is held
+ Assumes that line6->line6midi->lock is held
(i.e., this function is serialized).
*/
static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
@@ -166,12 +161,12 @@
line6_rawmidi_substream_midi(substream)->line6;
line6->line6midi->substream_transmit = substream;
- spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
+ spin_lock_irqsave(&line6->line6midi->lock, flags);
if (line6->line6midi->num_active_send_urbs == 0)
line6_midi_transmit(substream);
- spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
+ spin_unlock_irqrestore(&line6->line6midi->lock, flags);
}
static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
@@ -281,8 +276,7 @@
rmidi->private_free = snd_line6_midi_free;
init_waitqueue_head(&line6midi->send_wait);
- spin_lock_init(&line6midi->send_urb_lock);
- spin_lock_init(&line6midi->midi_transmit_lock);
+ spin_lock_init(&line6midi->lock);
line6midi->line6 = line6;
err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);