ath10k_usb_ctrl_diag_cmd_write
#define ATH10K_USB_MAX_DIAG_CMD (sizeof(struct ath10k_usb_ctrl_diag_cmd_write))
struct ath10k_usb_ctrl_diag_cmd_write *cmd;
cmd = (struct ath10k_usb_ctrl_diag_cmd_write *)ar_usb->diag_cmd_buffer;