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Message-ID: <Pine.LNX.4.64N.0710251458190.24086@blysk.ds.pg.gda.pl>
Date: Thu, 25 Oct 2007 15:09:35 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...ux-mips.org>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: linux-mips@...ux-mips.org, linux-serial@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] dz.c: Use a helper to cast from "struct uart_port *"
Replace all casts from "struct uart_port *" to "struct dz_port *" with a
construct based on container_of(). This makes the conversion work
irrespective of where the former struct is located within the latter.
By popular request I have implemented it as an inline function rather
than a macro this time.
Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
Tested with checkpatch.pl and at the run-time -- MIPS/Linux on a
DECstation 5000/200.
Please apply,
Maciej
patch-mips-2.6.23-rc5-20070904-dz-to_dport-2
diff -up --recursive --new-file linux-mips-2.6.23-rc5-20070904.macro/drivers/serial/dz.c linux-mips-2.6.23-rc5-20070904/drivers/serial/dz.c
--- linux-mips-2.6.23-rc5-20070904.macro/drivers/serial/dz.c 2007-10-13 12:57:52.000000000 +0000
+++ linux-mips-2.6.23-rc5-20070904/drivers/serial/dz.c 2007-10-13 19:48:07.000000000 +0000
@@ -65,6 +65,11 @@ struct dz_port {
static struct dz_port dz_ports[DZ_NB_PORT];
+static inline struct dz_port *to_dport(struct uart_port *uport)
+{
+ return container_of(uport, struct dz_port, port);
+}
+
/*
* ------------------------------------------------------------
* dz_in () and dz_out ()
@@ -103,7 +108,7 @@ static inline void dz_out(struct dz_port
static void dz_stop_tx(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned short tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
@@ -113,7 +118,7 @@ static void dz_stop_tx(struct uart_port
static void dz_start_tx(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned short tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
@@ -123,7 +128,7 @@ static void dz_start_tx(struct uart_port
static void dz_stop_rx(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
dport->cflag &= ~DZ_CREAD;
dz_out(dport, DZ_LPR, dport->cflag | dport->port.line);
@@ -347,7 +352,7 @@ static unsigned int dz_get_mctrl(struct
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
if (dport->port.line == DZ_MODEM) {
@@ -363,7 +368,7 @@ static void dz_set_mctrl(struct uart_por
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned short tmp;
if (dport->port.line == DZ_MODEM) {
@@ -385,7 +390,7 @@ static void dz_set_mctrl(struct uart_por
*/
static int dz_startup(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned short tmp;
@@ -411,7 +416,7 @@ static int dz_startup(struct uart_port *
*/
static void dz_shutdown(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned long flags;
spin_lock_irqsave(&dport->port.lock, flags);
@@ -433,7 +438,7 @@ static void dz_shutdown(struct uart_port
*/
static unsigned int dz_tx_empty(struct uart_port *uport)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned short tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR);
@@ -448,7 +453,7 @@ static void dz_break_ctl(struct uart_por
* FIXME: Can't access BREAK bits in TDR easily;
* reuse the code for polled TX. --macro
*/
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned short tmp, mask = 1 << dport->port.line;
@@ -465,7 +470,7 @@ static void dz_break_ctl(struct uart_por
static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
struct ktermios *old_termios)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned int cflag, baud;
@@ -672,7 +677,7 @@ static void dz_reset(struct dz_port *dpo
*/
static void dz_console_putchar(struct uart_port *uport, int ch)
{
- struct dz_port *dport = (struct dz_port *)uport;
+ struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned short csr, tcr, trdy, mask;
int loops = 10000;
-
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