3510c7aa06
The recent fix for adding rwsem nesting annotation was using the given
"hop" argument as the lock subclass key. Although the idea itself
works, it may trigger a kernel warning like:
BUG: looking up invalid subclass: 8
....
since the lockdep has a smaller number of subclasses (8) than we
currently allow for the hops there (10).
The current definition is merely a sanity check for avoiding the too
deep delivery paths, and the 8 hops are already enough. So, as a
quick fix, just follow the max hops as same as the max lockdep
subclasses.
Fixes: 1f20f9ff57 ("ALSA: seq: Fix nested rwsem annotation for lockdep splat")
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
110 lines
4 KiB
C
110 lines
4 KiB
C
#ifndef __SOUND_SEQ_KERNEL_H
|
|
#define __SOUND_SEQ_KERNEL_H
|
|
|
|
/*
|
|
* Main kernel header file for the ALSA sequencer
|
|
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
#include <linux/time.h>
|
|
#include <sound/asequencer.h>
|
|
|
|
typedef struct snd_seq_real_time snd_seq_real_time_t;
|
|
typedef union snd_seq_timestamp snd_seq_timestamp_t;
|
|
|
|
/* maximum number of queues */
|
|
#define SNDRV_SEQ_MAX_QUEUES 32
|
|
|
|
/* max number of concurrent clients */
|
|
#define SNDRV_SEQ_MAX_CLIENTS 192
|
|
|
|
/* max number of concurrent ports */
|
|
#define SNDRV_SEQ_MAX_PORTS 254
|
|
|
|
/* max number of events in memory pool */
|
|
#define SNDRV_SEQ_MAX_EVENTS 2000
|
|
|
|
/* default number of events in memory pool */
|
|
#define SNDRV_SEQ_DEFAULT_EVENTS 500
|
|
|
|
/* max number of events in memory pool for one client (outqueue) */
|
|
#define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000
|
|
|
|
/* default number of events in memory pool for one client (outqueue) */
|
|
#define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200
|
|
|
|
/* max delivery path length */
|
|
/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */
|
|
#define SNDRV_SEQ_MAX_HOPS 8
|
|
|
|
/* max size of event size */
|
|
#define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff
|
|
|
|
/* call-backs for kernel port */
|
|
struct snd_seq_port_callback {
|
|
struct module *owner;
|
|
void *private_data;
|
|
int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info);
|
|
int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info);
|
|
int (*use)(void *private_data, struct snd_seq_port_subscribe *info);
|
|
int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info);
|
|
int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop);
|
|
void (*private_free)(void *private_data);
|
|
/*...*/
|
|
};
|
|
|
|
/* interface for kernel client */
|
|
__printf(3, 4)
|
|
int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
|
|
const char *name_fmt, ...);
|
|
int snd_seq_delete_kernel_client(int client);
|
|
int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, int atomic, int hop);
|
|
int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop);
|
|
int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg);
|
|
|
|
#define SNDRV_SEQ_EXT_MASK 0xc0000000
|
|
#define SNDRV_SEQ_EXT_USRPTR 0x80000000
|
|
#define SNDRV_SEQ_EXT_CHAINED 0x40000000
|
|
|
|
typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count);
|
|
int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
|
|
int in_kernel, int size_aligned);
|
|
int snd_seq_dump_var_event(const struct snd_seq_event *event,
|
|
snd_seq_dump_func_t func, void *private_data);
|
|
|
|
/* interface for OSS emulation */
|
|
int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo);
|
|
|
|
/* port callback routines */
|
|
void snd_port_init_callback(struct snd_seq_port_callback *p);
|
|
struct snd_seq_port_callback *snd_port_alloc_callback(void);
|
|
|
|
/* port attach/detach */
|
|
int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp,
|
|
int cap, int type, int midi_channels, int midi_voices, char *portname);
|
|
int snd_seq_event_port_detach(int client, int port);
|
|
|
|
#ifdef CONFIG_MODULES
|
|
void snd_seq_autoload_init(void);
|
|
void snd_seq_autoload_exit(void);
|
|
#else
|
|
#define snd_seq_autoload_init()
|
|
#define snd_seq_autoload_exit()
|
|
#endif
|
|
|
|
#endif /* __SOUND_SEQ_KERNEL_H */
|