From 9f1096943a56c35cc85a0729ec759fd8a25e552f Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 29 Oct 2012 15:20:25 +0000 Subject: [PATCH] uart: tidy the uart_get_info API We pass both port and state because the original caller had both to hand. With all the attribute callers this won't be true so do the conversion in the function itself. The current callers all do lock/query/unlock. This won't be true for future set based cases but there are plenty of get ones that will exist so split the code with a helper for the future cases. Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 477e0790ddf2..0c4304ef66d9 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -634,10 +634,10 @@ static void uart_unthrottle(struct tty_struct *tty) uart_set_mctrl(port, TIOCM_RTS); } -static void uart_get_info(struct tty_port *port, - struct uart_state *state, +static void do_uart_get_info(struct tty_port *port, struct serial_struct *retinfo) { + struct uart_state *state = container_of(port, struct uart_state, port); struct uart_port *uport = state->uart_port; memset(retinfo, 0, sizeof(*retinfo)); @@ -662,17 +662,21 @@ static void uart_get_info(struct tty_port *port, retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; } -static int uart_get_info_user(struct uart_state *state, - struct serial_struct __user *retinfo) +static void uart_get_info(struct tty_port *port, + struct serial_struct *retinfo) { - struct tty_port *port = &state->port; - struct serial_struct tmp; - /* Ensure the state we copy is consistent and no hardware changes occur as we go */ mutex_lock(&port->mutex); - uart_get_info(port, state, &tmp); + do_uart_get_info(port, retinfo); mutex_unlock(&port->mutex); +} + +static int uart_get_info_user(struct tty_port *port, + struct serial_struct __user *retinfo) +{ + struct serial_struct tmp; + uart_get_info(port, &tmp); if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) return -EFAULT; @@ -1131,7 +1135,7 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, */ switch (cmd) { case TIOCGSERIAL: - ret = uart_get_info_user(state, uarg); + ret = uart_get_info_user(port, uarg); break; case TIOCSSERIAL: @@ -2331,12 +2335,8 @@ static ssize_t uart_get_attr_uartclk(struct device *dev, { struct serial_struct tmp; struct tty_port *port = dev_get_drvdata(dev); - struct uart_state *state = container_of(port, struct uart_state, port); - - mutex_lock(&port->mutex); - uart_get_info(port, state, &tmp); - mutex_unlock(&port->mutex); + uart_get_info(port, &tmp); return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); } @@ -2356,6 +2356,7 @@ static const struct attribute_group *tty_dev_attr_groups[] = { NULL }; + /** * uart_add_one_port - attach a driver-defined port structure * @drv: pointer to the uart low level driver structure for this port -- GitLab