diff options
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index c129a0e8e80..90621c3312b 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -1310,7 +1310,8 @@ static unsigned int check_modem_status(struct uart_8250_port *up) { unsigned int status = serial_in(up, UART_MSR); - if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI) { + if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && + up->port.info != NULL) { if (status & UART_MSR_TERI) up->port.icount.rng++; if (status & UART_MSR_DDSR) @@ -1333,8 +1334,9 @@ static inline void serial8250_handle_port(struct uart_8250_port *up) { unsigned int status; + unsigned long flags; - spin_lock(&up->port.lock); + spin_lock_irqsave(&up->port.lock, flags); status = serial_inp(up, UART_LSR); @@ -1346,7 +1348,7 @@ serial8250_handle_port(struct uart_8250_port *up) if (status & UART_LSR_THRE) transmit_chars(up); - spin_unlock(&up->port.lock); + spin_unlock_irqrestore(&up->port.lock, flags); } /* |