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| author | Takashi Iwai <tiwai@suse.de> | 2012-09-05 07:17:31 (GMT) |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-09-05 07:17:31 (GMT) |
| commit | 14e42917216ab0859827c2d8024df45a917301b4 (patch) | |
| tree | efbea5d1c54387d62a6fd66a21560232cf312fda /include/linux/kref.h | |
| parent | 292f2b6254c9dbb98def6d3521b07a837545ead0 (diff) | |
| parent | 4266274836e81575ee82498d84f4bd08ab7a7378 (diff) | |
| download | linux-fsl-qoriq-14e42917216ab0859827c2d8024df45a917301b4.tar.xz | |
Merge branch 'fixes' of git://git.alsa-project.org/alsa-kernel into for-next
Diffstat (limited to 'include/linux/kref.h')
| -rw-r--r-- | include/linux/kref.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/kref.h b/include/linux/kref.h index 9c07dce..65af688 100644 --- a/include/linux/kref.h +++ b/include/linux/kref.h @@ -18,6 +18,7 @@ #include <linux/bug.h> #include <linux/atomic.h> #include <linux/kernel.h> +#include <linux/mutex.h> struct kref { atomic_t refcount; @@ -93,4 +94,21 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref) { return kref_sub(kref, 1, release); } + +static inline int kref_put_mutex(struct kref *kref, + void (*release)(struct kref *kref), + struct mutex *lock) +{ + WARN_ON(release == NULL); + if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) { + mutex_lock(lock); + if (unlikely(!atomic_dec_and_test(&kref->refcount))) { + mutex_unlock(lock); + return 0; + } + release(kref); + return 1; + } + return 0; +} #endif /* _KREF_H_ */ |