239 struct fifo {  struct
247 static inline void fifo_init(struct fifo *fifo, int size)  in fifo_init()  argument
249 	fifo->r = fifo->w = fifo->count = 0;  in fifo_init()
250 	fifo->size = size;  in fifo_init()
251 	spin_lock_init(&fifo->lock);  in fifo_init()
257 static inline int fifo_add(struct fifo *fifo)  in fifo_add()  argument
262 	if (!fifo) {  in fifo_add()
266 	spin_lock_irqsave(&fifo->lock, flags);  in fifo_add()
267 	if (fifo->count == fifo->size) {  in fifo_add()
272 		index = fifo->w++ & (fifo->size - 1);  in fifo_add()
273 		fifo->count++;  in fifo_add()
275 	spin_unlock_irqrestore(&fifo->lock, flags);  in fifo_add()
282 static inline int fifo_remove(struct fifo *fifo)  in fifo_remove()  argument
287 	if (!fifo) {  in fifo_remove()
291 	spin_lock_irqsave(&fifo->lock, flags);  in fifo_remove()
292 	if (!fifo->count) {  in fifo_remove()
297 		index = fifo->r++ & (fifo->size - 1);  in fifo_remove()
298 		fifo->count--;  in fifo_remove()
300 	spin_unlock_irqrestore(&fifo->lock, flags);  in fifo_remove()
319 	struct fifo f;