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authorTakashi Iwai <tiwai@suse.de>2019-01-10 20:43:30 +0100
committerTakashi Iwai <tiwai@suse.de>2019-01-11 08:35:13 +0100
commit7f57cdcece5dcf693f64addfff0a1dff123e6624 (patch)
tree116ab796635f24f505fd97093f13b6edbd9d3b43
parentc0c0c4f1d65bdd6f926df2a634a22420ce71650c (diff)
ALSA: rawmidi: A lightweight function to discard pending bytes
(bsc#1121278). suse-commit: 24fe4ebf59d0a9ac9ac3b847dd7317e43e9c93de
-rw-r--r--include/sound/rawmidi.h1
-rw-r--r--sound/core/rawmidi.c22
-rw-r--r--sound/core/seq/seq_virmidi.c4
-rw-r--r--sound/usb/midi.c3
4 files changed, 25 insertions, 5 deletions
diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index 6665cb29e1a2..3b5a061132b6 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -171,6 +171,7 @@ int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count);
int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
int count);
+int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream);
/* main midi functions */
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 7a85f378534e..e8197bbd12b8 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1236,6 +1236,28 @@ int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
}
EXPORT_SYMBOL(snd_rawmidi_transmit);
+/**
+ * snd_rawmidi_proceed - Discard the all pending bytes and proceed
+ * @substream: rawmidi substream
+ *
+ * Return: the number of discarded bytes
+ */
+int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
+{
+ struct snd_rawmidi_runtime *runtime = substream->runtime;
+ unsigned long flags;
+ int count = 0;
+
+ spin_lock_irqsave(&runtime->lock, flags);
+ if (runtime->avail < runtime->buffer_size) {
+ count = runtime->buffer_size - runtime->avail;
+ __snd_rawmidi_transmit_ack(substream, count);
+ }
+ spin_unlock_irqrestore(&runtime->lock, flags);
+ return count;
+}
+EXPORT_SYMBOL(snd_rawmidi_proceed);
+
static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
const unsigned char __user *userbuf,
const unsigned char *kernelbuf,
diff --git a/sound/core/seq/seq_virmidi.c b/sound/core/seq/seq_virmidi.c
index cb988efd1ed0..e5a40795914a 100644
--- a/sound/core/seq/seq_virmidi.c
+++ b/sound/core/seq/seq_virmidi.c
@@ -149,9 +149,7 @@ static void snd_vmidi_output_work(struct work_struct *work)
/* discard the outputs in dispatch mode unless subscribed */
if (vmidi->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH &&
!(vmidi->rdev->flags & SNDRV_VIRMIDI_SUBSCRIBE)) {
- char buf[32];
- while (snd_rawmidi_transmit(substream, buf, sizeof(buf)) > 0)
- ; /* ignored */
+ snd_rawmidi_proceed(substream);
return;
}
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index aa1a72ea5762..c62ae8c7393e 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1175,8 +1175,7 @@ static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
if (port->ep->umidi->disconnected) {
/* gobble up remaining bytes to prevent wait in
* snd_rawmidi_drain_output */
- while (!snd_rawmidi_transmit_empty(substream))
- snd_rawmidi_transmit_ack(substream, 1);
+ snd_rawmidi_proceed(substream);
return;
}
tasklet_schedule(&port->ep->tasklet);