From bf936f92a7a564a2cdb44bbe3bc797cd811bf625 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Tue, 1 Jun 2010 22:52:43 +0200 Subject: [PATCH] riscom8: kill use of lock_kernel The riscom8 board uses lock_kernel to protect bits of the port setting ioctl logic. We can use the port mutex for this as the logic is internal and will also lock set versus open (a locking property that has been lost somewhere along the way) Signed-off-by: Alan Cox Cc: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- drivers/char/riscom8.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c index b02332a..af4de1f 100644 --- a/drivers/char/riscom8.c +++ b/drivers/char/riscom8.c @@ -47,7 +47,6 @@ #include #include #include -#include #include #include @@ -1184,6 +1183,7 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port, if (copy_from_user(&tmp, newinfo, sizeof(tmp))) return -EFAULT; + mutex_lock(&port->port.mutex); change_speed = ((port->port.flags & ASYNC_SPD_MASK) != (tmp.flags & ASYNC_SPD_MASK)); @@ -1191,8 +1191,10 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port, if ((tmp.close_delay != port->port.close_delay) || (tmp.closing_wait != port->port.closing_wait) || ((tmp.flags & ~ASYNC_USR_MASK) != - (port->port.flags & ~ASYNC_USR_MASK))) + (port->port.flags & ~ASYNC_USR_MASK))) { + mutex_unlock(&port->port.mutex); return -EPERM; + } port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) | (tmp.flags & ASYNC_USR_MASK)); } else { @@ -1208,6 +1210,7 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port, rc_change_speed(tty, bp, port); spin_unlock_irqrestore(&riscom_lock, flags); } + mutex_unlock(&port->port.mutex); return 0; } @@ -1220,12 +1223,15 @@ static int rc_get_serial_info(struct riscom_port *port, memset(&tmp, 0, sizeof(tmp)); tmp.type = PORT_CIRRUS; tmp.line = port - rc_port; + + mutex_lock(&port->port.mutex); tmp.port = bp->base; tmp.irq = bp->irq; tmp.flags = port->port.flags; tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC; tmp.close_delay = port->port.close_delay * HZ/100; tmp.closing_wait = port->port.closing_wait * HZ/100; + mutex_unlock(&port->port.mutex); tmp.xmit_fifo_size = CD180_NFIFO; return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0; } @@ -1242,14 +1248,10 @@ static int rc_ioctl(struct tty_struct *tty, struct file *filp, switch (cmd) { case TIOCGSERIAL: - lock_kernel(); retval = rc_get_serial_info(port, argp); - unlock_kernel(); break; case TIOCSSERIAL: - lock_kernel(); retval = rc_set_serial_info(tty, port, argp); - unlock_kernel(); break; default: retval = -ENOIOCTLCMD; -- 2.7.4