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isicom: kill off the BKL

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As with the others we can use the port mutex to get the needed locking
properties and fix the race with open.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-06-01 22:52:44 +02:00 committed by Greg Kroah-Hartman
parent bf936f92a7
commit ec82db129e
1 changed files with 5 additions and 8 deletions
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13
drivers/char/isicom.c
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@ -124,7 +124,6 @@
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
@ -872,7 +871,6 @@ static struct tty_port *isicom_find_port(struct tty_struct *tty)
static int isicom_open(struct tty_struct *tty, struct file *filp)
{
struct isi_port *port;
struct isi_board *card;
struct tty_port *tport;
tport = isicom_find_port(tty);
@ -1118,8 +1116,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
if (copy_from_user(&newinfo, info, sizeof(newinfo)))
return -EFAULT;
lock_kernel();
mutex_lock(&port->port.mutex);
reconfig_port = ((port->port.flags & ASYNC_SPD_MASK) !=
(newinfo.flags & ASYNC_SPD_MASK));
@ -1128,7 +1125,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
(newinfo.closing_wait != port->port.closing_wait) ||
((newinfo.flags & ~ASYNC_USR_MASK) !=
(port->port.flags & ~ASYNC_USR_MASK))) {
unlock_kernel();
mutex_unlock(&port->port.mutex);
return -EPERM;
}
port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
@ -1145,7 +1142,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
isicom_config_port(tty);
spin_unlock_irqrestore(&port->card->card_lock, flags);
}
unlock_kernel();
mutex_unlock(&port->port.mutex);
return 0;
}
@ -1154,7 +1151,7 @@ static int isicom_get_serial_info(struct isi_port *port,
{
struct serial_struct out_info;
lock_kernel();
mutex_lock(&port->port.mutex);
memset(&out_info, 0, sizeof(out_info));
/* out_info.type = ? */
out_info.line = port - isi_ports;
@ -1164,7 +1161,7 @@ static int isicom_get_serial_info(struct isi_port *port,
/* out_info.baud_base = ? */
out_info.close_delay = port->port.close_delay;
out_info.closing_wait = port->port.closing_wait;
unlock_kernel();
mutex_unlock(&port->port.mutex);
if (copy_to_user(info, &out_info, sizeof(out_info)))
return -EFAULT;
return 0;