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d5b657ee66
commit 8009d506a1 upstream.
The 'use' locking macros are no-ops if neither SMP or SND_DEBUG is
enabled. This might once have been OK in non-preemptible
configurations, but even in that case snd_seq_read() may sleep while
relying on a 'use' lock. So always use the proper implementations.
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
22 lines
573 B
C
22 lines
573 B
C
#ifndef __SND_SEQ_LOCK_H
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#define __SND_SEQ_LOCK_H
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#include <linux/sched.h>
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typedef atomic_t snd_use_lock_t;
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/* initialize lock */
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#define snd_use_lock_init(lockp) atomic_set(lockp, 0)
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/* increment lock */
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#define snd_use_lock_use(lockp) atomic_inc(lockp)
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/* release lock */
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#define snd_use_lock_free(lockp) atomic_dec(lockp)
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/* wait until all locks are released */
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void snd_use_lock_sync_helper(snd_use_lock_t *lock, const char *file, int line);
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#define snd_use_lock_sync(lockp) snd_use_lock_sync_helper(lockp, __BASE_FILE__, __LINE__)
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#endif /* __SND_SEQ_LOCK_H */
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