diff options
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 54e5cc0dd5f..fb610c3634a 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -41,6 +41,7 @@ #include <linux/serial.h> #include <linux/serial_8250.h> #include <linux/nmi.h> +#include <linux/mutex.h> #include <asm/io.h> #include <asm/irq.h> @@ -2467,7 +2468,7 @@ static struct platform_device *serial8250_isa_devs; * 16x50 serial ports to be configured at run-time, to support PCMCIA * modems and PCI multiport cards. */ -static DECLARE_MUTEX(serial_sem); +static DEFINE_MUTEX(serial_mutex); static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) { @@ -2522,7 +2523,7 @@ int serial8250_register_port(struct uart_port *port) if (port->uartclk == 0) return -EINVAL; - down(&serial_sem); + mutex_lock(&serial_mutex); uart = serial8250_find_match_or_unused(port); if (uart) { @@ -2544,7 +2545,7 @@ int serial8250_register_port(struct uart_port *port) if (ret == 0) ret = uart->port.line; } - up(&serial_sem); + mutex_unlock(&serial_mutex); return ret; } @@ -2561,7 +2562,7 @@ void serial8250_unregister_port(int line) { struct uart_8250_port *uart = &serial8250_ports[line]; - down(&serial_sem); + mutex_lock(&serial_mutex); uart_remove_one_port(&serial8250_reg, &uart->port); if (serial8250_isa_devs) { uart->port.flags &= ~UPF_BOOT_AUTOCONF; @@ -2571,7 +2572,7 @@ void serial8250_unregister_port(int line) } else { uart->port.dev = NULL; } - up(&serial_sem); + mutex_unlock(&serial_mutex); } EXPORT_SYMBOL(serial8250_unregister_port); |