| 19,7 → 19,6 |
|---|
| #include <linux/atomic.h> |
| #include <linux/kernel.h> |
| #include <linux/mutex.h> |
| #include <linux/spinlock.h> |
| |
| struct kref { |
| atomic_t refcount; |
| 99,38 → 98,6 |
|---|
| return kref_sub(kref, 1, release); |
| } |
| |
| /** |
| * kref_put_spinlock_irqsave - decrement refcount for object. |
| * @kref: object. |
| * @release: pointer to the function that will clean up the object when the |
| * last reference to the object is released. |
| * This pointer is required, and it is not acceptable to pass kfree |
| * in as this function. |
| * @lock: lock to take in release case |
| * |
| * Behaves identical to kref_put with one exception. If the reference count |
| * drops to zero, the lock will be taken atomically wrt dropping the reference |
| * count. The release function has to call spin_unlock() without _irqrestore. |
| */ |
| static inline int kref_put_spinlock_irqsave(struct kref *kref, |
| void (*release)(struct kref *kref), |
| spinlock_t *lock) |
| { |
| unsigned long flags; |
| |
| WARN_ON(release == NULL); |
| if (atomic_add_unless(&kref->refcount, -1, 1)) |
| return 0; |
| spin_lock_irqsave(lock, flags); |
| if (atomic_dec_and_test(&kref->refcount)) { |
| release(kref); |
| local_irq_restore(flags); |
| return 1; |
| } |
| spin_unlock_irqrestore(lock, flags); |
| return 0; |
| } |
| |
| static inline int kref_put_mutex(struct kref *kref, |
| void (*release)(struct kref *kref), |
| struct mutex *lock) |