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Commit 7584af10 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
Browse files

sound: rawmidi: record a substream's owner process 



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

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent e7373b70

include/sound/rawmidi.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

};

sound/core/rawmidi.c

+9 −0
Original line number Diff line number Diff line
@@ -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"