serial: use container_of to resolve uart_sunzilog_port from uart_port

Use container_of instead of casting first structure member.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 02df3940b95e4e14d5db2c4b35eb8a0ebe70be71..844aae7683cc897048c08d79f8a407c38e44c94b 100644 (file)
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -644,7 +644,8 @@ static unsigned int sunzilog_get_mctrl(struct uart_port *port)
 /* The port lock is held and interrupts are disabled.  */
 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
        unsigned char set_bits, clear_bits;
 
@@ -668,7 +669,8 @@ static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
 /* The port lock is held and interrupts are disabled.  */
 static void sunzilog_stop_tx(struct uart_port *port)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
 
        up->flags |= SUNZILOG_FLAG_TX_STOPPED;
 }
@@ -676,7 +678,8 @@ static void sunzilog_stop_tx(struct uart_port *port)
 /* The port lock is held and interrupts are disabled.  */
 static void sunzilog_start_tx(struct uart_port *port)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
        unsigned char status;
 
@@ -736,7 +739,8 @@ static void sunzilog_stop_rx(struct uart_port *port)
 /* The port lock is held.  */
 static void sunzilog_enable_ms(struct uart_port *port)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
        unsigned char new_reg;
 
@@ -752,7 +756,8 @@ static void sunzilog_enable_ms(struct uart_port *port)
 /* The port lock is not held.  */
 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
        unsigned char set_bits, clear_bits, new_reg;
        unsigned long flags;
@@ -938,7 +943,8 @@ static void
 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
                     struct ktermios *old)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        unsigned long flags;
        int baud, brg;
 
@@ -998,7 +1004,8 @@ static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *se
 static int sunzilog_get_poll_char(struct uart_port *port)
 {
        unsigned char ch, r1;
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
        struct zilog_channel __iomem *channel
                = ZILOG_CHANNEL_FROM_PORT(&up->port);
 
@@ -1032,7 +1039,8 @@ static int sunzilog_get_poll_char(struct uart_port *port)
 static void sunzilog_put_poll_char(struct uart_port *port,
                        unsigned char ch)
 {
-       struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
+       struct uart_sunzilog_port *up =
+               container_of(port, struct uart_sunzilog_port, port);
 
        sunzilog_putchar(&up->port, ch);
 }