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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>
111 lines
4.0 KiB
C
111 lines
4.0 KiB
C
#ifndef __SOUND_SEQ_KERNEL_H
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#define __SOUND_SEQ_KERNEL_H
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/*
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* Main kernel header file for the ALSA sequencer
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* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/time.h>
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#include <sound/asequencer.h>
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typedef struct snd_seq_real_time snd_seq_real_time_t;
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typedef union snd_seq_timestamp snd_seq_timestamp_t;
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/* maximum number of queues */
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#define SNDRV_SEQ_MAX_QUEUES 32
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/* max number of concurrent clients */
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#define SNDRV_SEQ_MAX_CLIENTS 192
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/* max number of concurrent ports */
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#define SNDRV_SEQ_MAX_PORTS 254
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/* max number of events in memory pool */
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#define SNDRV_SEQ_MAX_EVENTS 2000
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/* default number of events in memory pool */
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#define SNDRV_SEQ_DEFAULT_EVENTS 500
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/* max number of events in memory pool for one client (outqueue) */
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#define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000
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/* default number of events in memory pool for one client (outqueue) */
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#define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200
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/* max delivery path length */
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/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */
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#define SNDRV_SEQ_MAX_HOPS 8
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/* max size of event size */
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#define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff
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/* call-backs for kernel port */
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struct snd_seq_port_callback {
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struct module *owner;
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void *private_data;
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int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info);
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int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info);
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int (*use)(void *private_data, struct snd_seq_port_subscribe *info);
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int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info);
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int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop);
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void (*private_free)(void *private_data);
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/*...*/
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};
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/* interface for kernel client */
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__printf(3, 4)
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int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
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const char *name_fmt, ...);
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int snd_seq_delete_kernel_client(int client);
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int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, int atomic, int hop);
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int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop);
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int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg);
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#define SNDRV_SEQ_EXT_MASK 0xc0000000
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#define SNDRV_SEQ_EXT_USRPTR 0x80000000
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#define SNDRV_SEQ_EXT_CHAINED 0x40000000
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typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count);
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int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
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int in_kernel, int size_aligned);
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int snd_seq_dump_var_event(const struct snd_seq_event *event,
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snd_seq_dump_func_t func, void *private_data);
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/* interface for OSS emulation */
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int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo);
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/* port callback routines */
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void snd_port_init_callback(struct snd_seq_port_callback *p);
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struct snd_seq_port_callback *snd_port_alloc_callback(void);
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/* port attach/detach */
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int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp,
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int cap, int type, int midi_channels, int midi_voices, char *portname);
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int snd_seq_event_port_detach(int client, int port);
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#ifdef CONFIG_MODULES
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void snd_seq_autoload_init(void);
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void snd_seq_autoload_exit(void);
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#else
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#define snd_seq_autoload_init()
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#define snd_seq_autoload_exit()
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#endif
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#endif /* __SOUND_SEQ_KERNEL_H */
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