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292a089d78
Due to several bugs caused by timers being re-armed after they are
shutdown and just before they are freed, a new state of timers was added
called "shutdown". After a timer is set to this state, then it can no
longer be re-armed.
The following script was run to find all the trivial locations where
del_timer() or del_timer_sync() is called in the same function that the
object holding the timer is freed. It also ignores any locations where
the timer->function is modified between the del_timer*() and the free(),
as that is not considered a "trivial" case.
This was created by using a coccinelle script and the following
commands:
$ cat timer.cocci
@@
expression ptr, slab;
identifier timer, rfield;
@@
(
- del_timer(&ptr->timer);
+ timer_shutdown(&ptr->timer);
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- del_timer_sync(&ptr->timer);
+ timer_shutdown_sync(&ptr->timer);
)
... when strict
when != ptr->timer
(
kfree_rcu(ptr, rfield);
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kmem_cache_free(slab, ptr);
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kfree(ptr);
)
$ spatch timer.cocci . > /tmp/t.patch
$ patch -p1 < /tmp/t.patch
Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ]
Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ]
Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
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*
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* Routines for control of EMU WaveTable chip
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*/
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <sound/core.h>
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#include <sound/emux_synth.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include "emux_voice.h"
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MODULE_AUTHOR("Takashi Iwai");
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MODULE_DESCRIPTION("Routines for control of EMU WaveTable chip");
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MODULE_LICENSE("GPL");
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/*
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* create a new hardware dependent device for Emu8000/Emu10k1
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*/
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int snd_emux_new(struct snd_emux **remu)
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{
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struct snd_emux *emu;
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*remu = NULL;
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emu = kzalloc(sizeof(*emu), GFP_KERNEL);
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if (emu == NULL)
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return -ENOMEM;
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spin_lock_init(&emu->voice_lock);
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mutex_init(&emu->register_mutex);
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emu->client = -1;
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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emu->oss_synth = NULL;
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#endif
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emu->max_voices = 0;
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emu->use_time = 0;
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timer_setup(&emu->tlist, snd_emux_timer_callback, 0);
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emu->timer_active = 0;
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*remu = emu;
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return 0;
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}
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EXPORT_SYMBOL(snd_emux_new);
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/*
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*/
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static int sf_sample_new(void *private_data, struct snd_sf_sample *sp,
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struct snd_util_memhdr *hdr,
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const void __user *buf, long count)
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{
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struct snd_emux *emu = private_data;
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return emu->ops.sample_new(emu, sp, hdr, buf, count);
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}
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static int sf_sample_free(void *private_data, struct snd_sf_sample *sp,
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struct snd_util_memhdr *hdr)
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{
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struct snd_emux *emu = private_data;
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return emu->ops.sample_free(emu, sp, hdr);
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}
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static void sf_sample_reset(void *private_data)
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{
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struct snd_emux *emu = private_data;
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emu->ops.sample_reset(emu);
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}
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int snd_emux_register(struct snd_emux *emu, struct snd_card *card, int index, char *name)
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{
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int err;
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struct snd_sf_callback sf_cb;
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if (snd_BUG_ON(!emu->hw || emu->max_voices <= 0))
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return -EINVAL;
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if (snd_BUG_ON(!card || !name))
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return -EINVAL;
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emu->card = card;
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emu->name = kstrdup(name, GFP_KERNEL);
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emu->voices = kcalloc(emu->max_voices, sizeof(struct snd_emux_voice),
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GFP_KERNEL);
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if (emu->name == NULL || emu->voices == NULL)
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return -ENOMEM;
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/* create soundfont list */
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memset(&sf_cb, 0, sizeof(sf_cb));
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sf_cb.private_data = emu;
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if (emu->ops.sample_new)
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sf_cb.sample_new = sf_sample_new;
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if (emu->ops.sample_free)
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sf_cb.sample_free = sf_sample_free;
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if (emu->ops.sample_reset)
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sf_cb.sample_reset = sf_sample_reset;
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emu->sflist = snd_sf_new(&sf_cb, emu->memhdr);
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if (emu->sflist == NULL)
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return -ENOMEM;
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err = snd_emux_init_hwdep(emu);
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if (err < 0)
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return err;
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snd_emux_init_voices(emu);
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snd_emux_init_seq(emu, card, index);
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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snd_emux_init_seq_oss(emu);
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#endif
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snd_emux_init_virmidi(emu, card);
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snd_emux_proc_init(emu, card, index);
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return 0;
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}
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EXPORT_SYMBOL(snd_emux_register);
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/*
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*/
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int snd_emux_free(struct snd_emux *emu)
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{
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if (! emu)
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return -EINVAL;
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timer_shutdown_sync(&emu->tlist);
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snd_emux_proc_free(emu);
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snd_emux_delete_virmidi(emu);
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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snd_emux_detach_seq_oss(emu);
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#endif
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snd_emux_detach_seq(emu);
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snd_emux_delete_hwdep(emu);
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snd_sf_free(emu->sflist);
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kfree(emu->voices);
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kfree(emu->name);
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kfree(emu);
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return 0;
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}
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EXPORT_SYMBOL(snd_emux_free);
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