s3c2440_i2s_buf
*out = kmem_alloc(sizeof(struct s3c2440_i2s_buf), KM_SLEEP);
kmem_free(*out, sizeof(struct s3c2440_i2s_buf));
kmem_free(buf, sizeof(struct s3c2440_i2s_buf));
typedef struct s3c2440_i2s_buf* s3c2440_i2s_buf_t;