taglinefilesource code
UART_LSR_OE401drivers/char/serial.celse if (*status & UART_LSR_OE) 
UART_LSR_OE1248drivers/char/serial.cinfo->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
UART_LSR_OE1267drivers/char/serial.cinfo->ignore_status_mask |= UART_LSR_OE;
UART_LSR_OE1268drivers/char/serial.cinfo->read_status_mask |= UART_LSR_OE;