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[SERIAL] turn serial semaphores into mutexes

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Turn several drivers/serial/ semaphores-used-as-mutex into mutexes

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Arjan van de Ven
2006-01-12 18:44:32 +00:00
committed by Russell King
parent 593195f9b2
commit f392ecfa12
5 changed files with 36 additions and 35 deletions
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11
drivers/serial/8250.c
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@ -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);