From 7584af10cf46e0f4aa1696f1be79fa0f19a945ba Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@ladisch.de>
Date: Tue, 10 Nov 2009 10:14:04 +0100
Subject: [PATCH] sound: rawmidi: record a substream's owner process

Record the pid of the task that opened a RawMIDI substream.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/sound/rawmidi.h | 2 ++
 sound/core/rawmidi.c    | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index c23c2658570..2480e7d10dc 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -46,6 +46,7 @@
 struct snd_rawmidi;
 struct snd_rawmidi_substream;
 struct snd_seq_port_info;
+struct pid;
 
 struct snd_rawmidi_ops {
 	int (*open) (struct snd_rawmidi_substream * substream);
@@ -97,6 +98,7 @@ struct snd_rawmidi_substream {
 	struct snd_rawmidi_str *pstr;
 	char name[32];
 	struct snd_rawmidi_runtime *runtime;
+	struct pid *pid;
 	/* hardware layer */
 	struct snd_rawmidi_ops *ops;
 };
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 818b1299ed9..2f766123b15 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -278,6 +278,7 @@ static int open_substream(struct snd_rawmidi *rmidi,
 		substream->active_sensing = 0;
 		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++;
@@ -488,6 +489,8 @@ 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--;
 }
 
@@ -1336,6 +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"
@@ -1357,6 +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"