diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index cdea151a32eb..b519c21a6fd2 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -32,6 +32,7 @@ /* Offsets for the DesignWare specific registers */ #define DW_UART_USR 0x1f /* UART Status Register */ #define DW_UART_DLF 0xc0 /* Divisor Latch Fraction Register */ +#define DW_UART_RFL 0x21 /* UART Receive Fifo Level Register */ #define DW_UART_CPR 0xf4 /* Component Parameter Register */ #define DW_UART_UCV 0xf8 /* UART Component Version */ @@ -257,7 +258,7 @@ static int dw8250_handle_irq(struct uart_port *p) { struct dw8250_data *d = p->private_data; unsigned int iir = p->serial_in(p, UART_IIR); - unsigned int status; + unsigned int status, usr, rfl; unsigned long flags; /* @@ -269,9 +270,10 @@ static int dw8250_handle_irq(struct uart_port *p) */ if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT) { spin_lock_irqsave(&p->lock, flags); + usr = p->serial_in(p, d->usr_reg); status = p->serial_in(p, UART_LSR); - - if (!(status & (UART_LSR_DR | UART_LSR_BI))) + rfl = p->serial_in(p, DW_UART_RFL); + if (!(status & (UART_LSR_DR | UART_LSR_BI)) && !(usr & 0x1) && (rfl == 0)) (void) p->serial_in(p, UART_RX); spin_unlock_irqrestore(&p->lock, flags);