From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934602Ab0EEKke (ORCPT ); Wed, 5 May 2010 06:40:34 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:54762 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934533Ab0EEKkX (ORCPT ); Wed, 5 May 2010 06:40:23 -0400 From: Alan Cox Subject: [PATCH 03/20] riscom8: kill use of lock_kernel To: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de Date: Wed, 05 May 2010 11:01:57 +0100 Message-ID: <20100505100156.3595.84007.stgit@localhost.localdomain> In-Reply-To: <20100505100144.3595.65633.stgit@localhost.localdomain> References: <20100505100144.3595.65633.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/char/riscom8.c | 14 ++++++++------ 1 files 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;