diff options
| author | Dave Airlie <airlied@redhat.com> | 2012-08-27 16:22:20 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-08-27 16:22:20 +1000 |
| commit | 93bb70e0c00f1be4cc857e4d8375c44058cce71e (patch) | |
| tree | 7b6a11844e00b3f4bf8281c7a799e61494220819 /include/linux/kref.h | |
| parent | 6f314ebbaa2667d67a7206ba78f28e46cf47eda5 (diff) | |
| parent | c182ae42cc3611f7b3fa803c0bcab6e5d29bea63 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into drm-next
There was some merge conflicts in -next and they weren't so pretty, so
backmerge now to avoid them.
Conflicts:
drivers/gpu/drm/i915/i915_gem.c
drivers/gpu/drm/i915/intel_modes.c
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 9c07dcebded..65af6887872 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_ */ |