uml: console subsystem tidying

This does a lot of cleanup on the UML console system.  This patch should be
entirely non-functional.

The tidying is as follows:
	header cleanups - the includes should be closer to minimal and complete
	all printks now have a severity
	lots of style fixes
	fd_close is restructured a little in order to reduce the nesting
	some functions were calling the os_* wrappers when they can
call libc directly
	port_accept had a unnecessary variable
	it also tested a pid unecessarily before killing it
	some functions were made static
	xterm_free is gone, as it was identical to generic_free

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/drivers/chan_kern.c

@@ -1,28 +1,19 @@
 /*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
  * Licensed under the GPL
  */
 
-#include <linux/stddef.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/tty.h>
-#include <linux/string.h>
 #include <linux/tty_flip.h>
-#include <asm/irq.h>
 #include "chan_kern.h"
-#include "kern.h"
-#include "irq_user.h"
-#include "sigio.h"
-#include "line.h"
 #include "os.h"
 
 #ifdef CONFIG_NOCONFIG_CHAN
 static void *not_configged_init(char *str, int device,
 				const struct chan_opts *opts)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return NULL;
 }
@@ -30,34 +21,34 @@ static void *not_configged_init(char *str, int device,
 static int not_configged_open(int input, int output, int primary, void *data,
 			      char **dev_out)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return -ENODEV;
 }
 
 static void not_configged_close(int fd, void *data)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 }
 
 static int not_configged_read(int fd, char *c_out, void *data)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return -EIO;
 }
 
 static int not_configged_write(int fd, const char *buf, int len, void *data)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return -EIO;
 }
 
 static int not_configged_console_write(int fd, const char *buf, int len)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return -EIO;
 }
@@ -65,14 +56,14 @@ static int not_configged_console_write(int fd, const char *buf, int len)
 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
 				     unsigned short *cols)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 	return -ENODEV;
 }
 
 static void not_configged_free(void *data)
 {
-	printk("Using a channel type which is configured out of "
+	printk(KERN_ERR "Using a channel type which is configured out of "
 	       "UML\n");
 }
 
@@ -91,14 +82,15 @@ static const struct chan_ops not_configged_ops = {
 
 static void tty_receive_char(struct tty_struct *tty, char ch)
 {
-	if(tty == NULL) return;
+	if (tty == NULL)
+		return;
 
-	if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
-		if(ch == STOP_CHAR(tty)){
+	if (I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
+		if (ch == STOP_CHAR(tty)) {
 			stop_tty(tty);
 			return;
 		}
-		else if(ch == START_CHAR(tty)){
+		else if (ch == START_CHAR(tty)) {
 			start_tty(tty);
 			return;
 		}
@@ -111,14 +103,14 @@ static int open_one_chan(struct chan *chan)
 {
 	int fd, err;
 
-	if(chan->opened)
+	if (chan->opened)
 		return 0;
 
-	if(chan->ops->open == NULL)
+	if (chan->ops->open == NULL)
 		fd = 0;
 	else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
 				     chan->data, &chan->dev);
-	if(fd < 0)
+	if (fd < 0)
 		return fd;
 
 	err = os_set_fd_block(fd, 0);
@@ -139,10 +131,10 @@ int open_chan(struct list_head *chans)
 	struct chan *chan;
 	int ret, err = 0;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
 		ret = open_one_chan(chan);
-		if(chan->primary)
+		if (chan->primary)
 			err = ret;
 	}
 	return err;
@@ -153,9 +145,9 @@ void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
 	struct list_head *ele;
 	struct chan *chan;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(chan->primary && chan->output && chan->ops->winch){
+		if (chan->primary && chan->output && chan->ops->winch) {
 			register_winch(chan->fd, tty);
 			return;
 		}
@@ -168,7 +160,7 @@ int enable_chan(struct line *line)
 	struct chan *chan;
 	int err;
 
-	list_for_each(ele, &line->chan_list){
+	list_for_each(ele, &line->chan_list) {
 		chan = list_entry(ele, struct chan, list);
 		err = open_one_chan(chan);
 		if (err) {
@@ -178,7 +170,7 @@ int enable_chan(struct line *line)
 			continue;
 		}
 
-		if(chan->enabled)
+		if (chan->enabled)
 			continue;
 		err = line_setup_irq(chan->fd, chan->input, chan->output, line,
 				     chan);
@@ -215,12 +207,12 @@ void free_irqs(void)
 	list_splice_init(&irqs_to_free, &list);
 	spin_unlock_irqrestore(&irqs_to_free_lock, flags);
 
-	list_for_each(ele, &list){
+	list_for_each(ele, &list) {
 		chan = list_entry(ele, struct chan, free_list);
 
-		if(chan->input)
+		if (chan->input)
 			free_irq(chan->line->driver->read_irq, chan);
-		if(chan->output)
+		if (chan->output)
 			free_irq(chan->line->driver->write_irq, chan);
 		chan->enabled = 0;
 	}
@@ -230,22 +222,22 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
 {
 	unsigned long flags;
 
-	if(!chan->opened)
+	if (!chan->opened)
 		return;
 
-	if(delay_free_irq){
+	if (delay_free_irq) {
 		spin_lock_irqsave(&irqs_to_free_lock, flags);
 		list_add(&chan->free_list, &irqs_to_free);
 		spin_unlock_irqrestore(&irqs_to_free_lock, flags);
 	}
 	else {
-		if(chan->input)
+		if (chan->input)
 			free_irq(chan->line->driver->read_irq, chan);
-		if(chan->output)
+		if (chan->output)
 			free_irq(chan->line->driver->write_irq, chan);
 		chan->enabled = 0;
 	}
-	if(chan->ops->close != NULL)
+	if (chan->ops->close != NULL)
 		(*chan->ops->close)(chan->fd, chan->data);
 
 	chan->opened = 0;
@@ -274,7 +266,7 @@ void deactivate_chan(struct list_head *chans, int irq)
 	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
 
-		if(chan->enabled && chan->input)
+		if (chan->enabled && chan->input)
 			deactivate_fd(chan->fd, irq);
 	}
 }
@@ -287,7 +279,7 @@ void reactivate_chan(struct list_head *chans, int irq)
 	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
 
-		if(chan->enabled && chan->input)
+		if (chan->enabled && chan->input)
 			reactivate_fd(chan->fd, irq);
 	}
 }
@@ -303,6 +295,7 @@ int write_chan(struct list_head *chans, const char *buf, int len,
 		chan = list_entry(ele, struct chan, list);
 		if (!chan->output || (chan->ops->write == NULL))
 			continue;
+
 		n = chan->ops->write(chan->fd, buf, len, chan->data);
 		if (chan->primary) {
 			ret = n;
@@ -319,12 +312,14 @@ int console_write_chan(struct list_head *chans, const char *buf, int len)
 	struct chan *chan;
 	int n, ret = 0;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(!chan->output || (chan->ops->console_write == NULL))
+		if (!chan->output || (chan->ops->console_write == NULL))
 			continue;
+
 		n = chan->ops->console_write(chan->fd, buf, len);
-		if(chan->primary) ret = n;
+		if (chan->primary)
+			ret = n;
 	}
 	return ret;
 }
@@ -334,10 +329,11 @@ int console_open_chan(struct line *line, struct console *co)
 	int err;
 
 	err = open_chan(&line->chan_list);
-	if(err)
+	if (err)
 		return err;
 
-	printk("Console initialized on /dev/%s%d\n", co->name, co->index);
+	printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
+	       co->index);
 	return 0;
 }
 
@@ -347,10 +343,10 @@ int chan_window_size(struct list_head *chans, unsigned short *rows_out,
 	struct list_head *ele;
 	struct chan *chan;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(chan->primary){
-			if(chan->ops->window_size == NULL)
+		if (chan->primary) {
+			if (chan->ops->window_size == NULL)
 				return 0;
 			return chan->ops->window_size(chan->fd, chan->data,
 						      rows_out, cols_out);
@@ -365,10 +361,11 @@ static void free_one_chan(struct chan *chan, int delay_free_irq)
 
 	close_one_chan(chan, delay_free_irq);
 
-	if(chan->ops->free != NULL)
+	if (chan->ops->free != NULL)
 		(*chan->ops->free)(chan->data);
 
-	if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
+	if (chan->primary && chan->output)
+		ignore_sigio_fd(chan->fd);
 	kfree(chan);
 }
 
@@ -377,7 +374,7 @@ static void free_chan(struct list_head *chans, int delay_free_irq)
 	struct list_head *ele, *next;
 	struct chan *chan;
 
-	list_for_each_safe(ele, next, chans){
+	list_for_each_safe(ele, next, chans) {
 		chan = list_entry(ele, struct chan, list);
 		free_one_chan(chan, delay_free_irq);
 	}
@@ -388,14 +385,14 @@ static int one_chan_config_string(struct chan *chan, char *str, int size,
 {
 	int n = 0;
 
-	if(chan == NULL){
+	if (chan == NULL) {
 		CONFIG_CHUNK(str, size, n, "none", 1);
 		return n;
 	}
 
 	CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
 
-	if(chan->dev == NULL){
+	if (chan->dev == NULL) {
 		CONFIG_CHUNK(str, size, n, "", 1);
 		return n;
 	}
@@ -415,7 +412,7 @@ static int chan_pair_config_string(struct chan *in, struct chan *out,
 	str += n;
 	size -= n;
 
-	if(in == out){
+	if (in == out) {
 		CONFIG_CHUNK(str, size, n, "", 1);
 		return n;
 	}
@@ -435,13 +432,13 @@ int chan_config_string(struct list_head *chans, char *str, int size,
 	struct list_head *ele;
 	struct chan *chan, *in = NULL, *out = NULL;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(!chan->primary)
+		if (!chan->primary)
 			continue;
-		if(chan->input)
+		if (chan->input)
 			in = chan;
-		if(chan->output)
+		if (chan->output)
 			out = chan;
 	}
 
@@ -500,27 +497,27 @@ static struct chan *parse_chan(struct line *line, char *str, int device,
 
 	ops = NULL;
 	data = NULL;
-	for(i = 0; i < ARRAY_SIZE(chan_table); i++){
+	for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
 		entry = &chan_table[i];
-		if(!strncmp(str, entry->key, strlen(entry->key))){
+		if (!strncmp(str, entry->key, strlen(entry->key))) {
 			ops = entry->ops;
 			str += strlen(entry->key);
 			break;
 		}
 	}
-	if(ops == NULL){
+	if (ops == NULL) {
 		*error_out = "No match for configured backends";
 		return NULL;
 	}
 
 	data = (*ops->init)(str, device, opts);
-	if(data == NULL){
+	if (data == NULL) {
 		*error_out = "Configuration failed";
 		return NULL;
 	}
 
 	chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
-	if(chan == NULL){
+	if (chan == NULL) {
 		*error_out = "Memory allocation failed";
 		return NULL;
 	}
@@ -546,26 +543,26 @@ int parse_chan_pair(char *str, struct line *line, int device,
 	struct chan *new, *chan;
 	char *in, *out;
 
-	if(!list_empty(chans)){
+	if (!list_empty(chans)) {
 		chan = list_entry(chans->next, struct chan, list);
 		free_chan(chans, 0);
 		INIT_LIST_HEAD(chans);
 	}
 
 	out = strchr(str, ',');
-	if(out != NULL){
+	if (out != NULL) {
 		in = str;
 		*out = '\0';
 		out++;
 		new = parse_chan(line, in, device, opts, error_out);
-		if(new == NULL)
+		if (new == NULL)
 			return -1;
 
 		new->input = 1;
 		list_add(&new->list, chans);
 
 		new = parse_chan(line, out, device, opts, error_out);
-		if(new == NULL)
+		if (new == NULL)
 			return -1;
 
 		list_add(&new->list, chans);
@@ -573,7 +570,7 @@ int parse_chan_pair(char *str, struct line *line, int device,
 	}
 	else {
 		new = parse_chan(line, str, device, opts, error_out);
-		if(new == NULL)
+		if (new == NULL)
 			return -1;
 
 		list_add(&new->list, chans);
@@ -588,9 +585,9 @@ int chan_out_fd(struct list_head *chans)
 	struct list_head *ele;
 	struct chan *chan;
 
-	list_for_each(ele, chans){
+	list_for_each(ele, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(chan->primary && chan->output)
+		if (chan->primary && chan->output)
 			return chan->fd;
 	}
 	return -1;
@@ -604,23 +601,25 @@ void chan_interrupt(struct list_head *chans, struct delayed_work *task,
 	int err;
 	char c;
 
-	list_for_each_safe(ele, next, chans){
+	list_for_each_safe(ele, next, chans) {
 		chan = list_entry(ele, struct chan, list);
-		if(!chan->input || (chan->ops->read == NULL)) continue;
+		if (!chan->input || (chan->ops->read == NULL))
+			continue;
 		do {
 			if (tty && !tty_buffer_request_room(tty, 1)) {
 				schedule_delayed_work(task, 1);
 				goto out;
 			}
 			err = chan->ops->read(chan->fd, &c, chan->data);
-			if(err > 0)
+			if (err > 0)
 				tty_receive_char(tty, c);
-		} while(err > 0);
+		} while (err > 0);
 
-		if(err == 0) reactivate_fd(chan->fd, irq);
-		if(err == -EIO){
-			if(chan->primary){
-				if(tty != NULL)
+		if (err == 0)
+			reactivate_fd(chan->fd, irq);
+		if (err == -EIO) {
+			if (chan->primary) {
+				if (tty != NULL)
 					tty_hangup(tty);
 				close_chan(chans, 1);
 				return;
@@ -629,5 +628,6 @@ void chan_interrupt(struct list_head *chans, struct delayed_work *task,
 		}
 	}
  out:
-	if(tty) tty_flip_buffer_push(tty);
+	if (tty)
+		tty_flip_buffer_push(tty);
 }