1 files changed, 33 insertions, 28 deletions

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index c0adc14..0f5a194 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -242,13 +242,12 @@ static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 		return -ENXIO;
 	if (subdevice >= 0 && subdevice >= s->substream_count)
 		return -ENODEV;
-	if (s->substream_opened >= s->substream_count)
-		return -EAGAIN;
 
 	list_for_each_entry(substream, &s->substreams, list) {
 		if (substream->opened) {
 			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
-			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND))
+			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
+			    !substream->append)
 				continue;
 		}
 		if (subdevice < 0 || subdevice == substream->number) {
@@ -266,18 +265,23 @@ static int open_substream(struct snd_rawmidi *rmidi,
 {
 	int err;
 
-	err = snd_rawmidi_runtime_create(substream);
-	if (err < 0)
-		return err;
-	err = substream->ops->open(substream);
-	if (err < 0)
-		return err;
-	substream->opened = 1;
-	if (substream->use_count++ == 0)
+	if (substream->use_count == 0) {
+		err = snd_rawmidi_runtime_create(substream);
+		if (err < 0)
+			return err;
+		err = substream->ops->open(substream);
+		if (err < 0) {
+			snd_rawmidi_runtime_free(substream);
+			return err;
+		}
+		substream->opened = 1;
 		substream->active_sensing = 0;
-	if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
-		substream->append = 1;
-	rmidi->streams[substream->stream].substream_opened++;
+		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
+			substream->append = 1;
+		substream->pid = get_pid(task_pid(current));
+		rmidi->streams[substream->stream].substream_opened++;
+	}
+	substream->use_count++;
 	return 0;
 }
 
@@ -297,27 +301,27 @@ static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 				       SNDRV_RAWMIDI_STREAM_INPUT,
 				       mode, &sinput);
 		if (err < 0)
-			goto __error;
+			return err;
 	}
 	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 		err = assign_substream(rmidi, subdevice,
 				       SNDRV_RAWMIDI_STREAM_OUTPUT,
 				       mode, &soutput);
 		if (err < 0)
-			goto __error;
+			return err;
 	}
 
 	if (sinput) {
 		err = open_substream(rmidi, sinput, mode);
 		if (err < 0)
-			goto __error;
+			return err;
 	}
 	if (soutput) {
 		err = open_substream(rmidi, soutput, mode);
 		if (err < 0) {
 			if (sinput)
 				close_substream(rmidi, sinput, 0);
-			goto __error;
+			return err;
 		}
 	}
 
@@ -325,13 +329,6 @@ static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 	rfile->input = sinput;
 	rfile->output = soutput;
 	return 0;
-
-      __error:
-	if (sinput && sinput->runtime)
-		snd_rawmidi_runtime_free(sinput);
-	if (soutput && soutput->runtime)
-		snd_rawmidi_runtime_free(soutput);
-	return err;
 }
 
 /* called from sound/core/seq/seq_midi.c */
@@ -415,7 +412,7 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
 		subdevice = -1;
 		read_lock(&card->ctl_files_rwlock);
 		list_for_each_entry(kctl, &card->ctl_files, list) {
-			if (kctl->pid == current->pid) {
+			if (kctl->pid == task_pid(current)) {
 				subdevice = kctl->prefer_rawmidi_subdevice;
 				if (subdevice != -1)
 					break;
@@ -468,7 +465,6 @@ static void close_substream(struct snd_rawmidi *rmidi,
 			    struct snd_rawmidi_substream *substream,
 			    int cleanup)
 {
-	rmidi->streams[substream->stream].substream_opened--;
 	if (--substream->use_count)
 		return;
 
@@ -493,6 +489,9 @@ static void close_substream(struct snd_rawmidi *rmidi,
 	snd_rawmidi_runtime_free(substream);
 	substream->opened = 0;
 	substream->append = 0;
+	put_pid(substream->pid);
+	substream->pid = NULL;
+	rmidi->streams[substream->stream].substream_opened--;
 }
 
 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
@@ -1258,7 +1257,7 @@ static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
 			break;
 		count -= count1;
 	}
-	if (file->f_flags & O_SYNC) {
+	if (file->f_flags & O_DSYNC) {
 		spin_lock_irq(&runtime->lock);
 		while (runtime->avail != runtime->buffer_size) {
 			wait_queue_t wait;
@@ -1340,6 +1339,9 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
 				    substream->number,
 				    (unsigned long) substream->bytes);
 			if (substream->opened) {
+				snd_iprintf(buffer,
+				    "  Owner PID    : %d\n",
+				    pid_vnr(substream->pid));
 				runtime = substream->runtime;
 				snd_iprintf(buffer,
 				    "  Mode         : %s\n"
@@ -1361,6 +1363,9 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
 				    substream->number,
 				    (unsigned long) substream->bytes);
 			if (substream->opened) {
+				snd_iprintf(buffer,
+					    "  Owner PID    : %d\n",
+					    pid_vnr(substream->pid));
 				runtime = substream->runtime;
 				snd_iprintf(buffer,
 					    "  Buffer size  : %lu\n"