int videobuf_read_start(struct videobuf_queue *q) { int rc; mutex_lock(&q->lock); rc = __videobuf_read_start(q); mutex_unlock(&q->lock); return rc; }
int videobuf_read_start(struct videobuf_queue *q) { int rc; videobuf_queue_lock(q); rc = __videobuf_read_start(q); videobuf_queue_unlock(q); return rc; }
ssize_t videobuf_read_stream(struct videobuf_queue *q, char __user *data, size_t count, loff_t *ppos, int vbihack, int nonblocking) { int rc, retval; unsigned long flags=0; MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); dprintk(2,"%s\n",__FUNCTION__); mutex_lock(&q->lock); retval = -EBUSY; if (q->streaming) goto done; if (!q->reading) { retval = __videobuf_read_start(q); if (retval < 0) goto done; } retval = 0; while (count > 0) { /* get / wait for data */ if (NULL == q->read_buf) { q->read_buf = list_entry(q->stream.next, struct videobuf_buffer, stream); list_del(&q->read_buf->stream); q->read_off = 0; } rc = videobuf_waiton(q->read_buf, nonblocking, 1); if (rc < 0) { if (0 == retval) retval = rc; break; } if (q->read_buf->state == STATE_DONE) { rc = CALL (q,copy_stream, q, data + retval, count, retval, vbihack, nonblocking); if (rc < 0) { retval = rc; break; } retval += rc; count -= rc; q->read_off += rc; } else { /* some error */ q->read_off = q->read_buf->size; if (0 == retval) retval = -EIO; } /* requeue buffer when done with copying */ if (q->read_off == q->read_buf->size) { list_add_tail(&q->read_buf->stream, &q->stream); if (q->irqlock) spin_lock_irqsave(q->irqlock,flags); q->ops->buf_queue(q,q->read_buf); if (q->irqlock) spin_unlock_irqrestore(q->irqlock,flags); q->read_buf = NULL; } if (retval < 0) break; }