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-rw-r--r--drivers/serial/serial_core.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 977ce820ce30..f7263e104d81 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -914,14 +914,14 @@ static void uart_break_ctl(struct tty_struct *tty, int break_state)
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
- BUG_ON(!kernel_locked());
-
+ lock_kernel();
mutex_lock(&state->mutex);
if (port->type != PORT_UNKNOWN)
port->ops->break_ctl(port, break_state);
mutex_unlock(&state->mutex);
+ unlock_kernel();
}
static int uart_do_autoconfig(struct uart_state *state)
@@ -1059,7 +1059,7 @@ static int uart_get_count(struct uart_state *state,
}
/*
- * Called via sys_ioctl under the BKL. We can use spin_lock_irq() here.
+ * Called via sys_ioctl. We can use spin_lock_irq() here.
*/
static int
uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd,
@@ -1069,8 +1069,8 @@ uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd,
void __user *uarg = (void __user *)arg;
int ret = -ENOIOCTLCMD;
- BUG_ON(!kernel_locked());
+ lock_kernel();
/*
* These ioctls don't rely on the hardware to be present.
*/
@@ -1143,6 +1143,7 @@ uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd,
out_up:
mutex_unlock(&state->mutex);
out:
+ unlock_kernel();
return ret;
}
@@ -1153,7 +1154,6 @@ static void uart_set_termios(struct tty_struct *tty,
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
- BUG_ON(!kernel_locked());
/*
* These are the bits that are used to setup various
@@ -1165,9 +1165,11 @@ static void uart_set_termios(struct tty_struct *tty,
if ((cflag ^ old_termios->c_cflag) == 0 &&
tty->termios->c_ospeed == old_termios->c_ospeed &&
tty->termios->c_ispeed == old_termios->c_ispeed &&
- RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
+ RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) {
return;
+ }
+ lock_kernel();
uart_change_speed(state, old_termios);
/* Handle transition to B0 status */
@@ -1200,7 +1202,7 @@ static void uart_set_termios(struct tty_struct *tty,
}
spin_unlock_irqrestore(&state->port->lock, flags);
}
-
+ unlock_kernel();
#if 0
/*
* No need to wake up processes in open wait, since they