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>

1 files changed, 16 insertions, 8 deletions

diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 02df3940b95e..844aae7683cc 100644
--- 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);
 }