diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 09475695effd..b0af13074cd3 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1872,7 +1872,7 @@ static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir) switch (iir & 0x3f) { case UART_IIR_RX_TIMEOUT: serial8250_rx_dma_flush(up); - /* fall-through */ + fallthrough; case UART_IIR_RLSI: return true; } @@ -2275,6 +2275,10 @@ int serial8250_do_startup(struct uart_port *port) if (port->irq && !(up->port.flags & UPF_NO_THRE_TEST)) { unsigned char iir1; + + if (port->irqflags & IRQF_SHARED) + disable_irq_nosync(port->irq); + /* * Test for UARTs that do not reassert THRE when the * transmitter is idle and the interrupt has already @@ -2284,8 +2288,6 @@ int serial8250_do_startup(struct uart_port *port) * allow register changes to become visible. */ spin_lock_irqsave(&port->lock, flags); - if (up->port.irqflags & IRQF_SHARED) - disable_irq_nosync(port->irq); wait_for_xmitr(up, UART_LSR_THRE); serial_port_out_sync(port, UART_IER, UART_IER_THRI); @@ -2297,9 +2299,10 @@ int serial8250_do_startup(struct uart_port *port) iir = serial_port_in(port, UART_IIR); serial_port_out(port, UART_IER, 0); + spin_unlock_irqrestore(&port->lock, flags); + if (port->irqflags & IRQF_SHARED) enable_irq(port->irq); - spin_unlock_irqrestore(&port->lock, flags); /* * If the interrupt is not reasserted, or we otherwise @@ -2650,6 +2653,10 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk) goto out_lock; port->uartclk = uartclk; + + if (!tty_port_initialized(&port->state->port)) + goto out_lock; + termios = &port->state->port.tty->termios; baud = serial8250_get_baud_rate(port, termios, NULL); @@ -2662,7 +2669,6 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk) serial8250_set_divisor(port, baud, quot, frac); serial_port_out(port, UART_LCR, up->lcr); - serial8250_out_MCR(up, UART_MCR_DTR | UART_MCR_RTS); spin_unlock_irqrestore(&port->lock, flags); serial8250_rpm_put(up); |