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Diffstat (limited to 'arch/um/drivers/line.c')
-rw-r--r--arch/um/drivers/line.c237
1 files changed, 117 insertions, 120 deletions
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 3e0b68e297f..76fe0b0da99 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -1,22 +1,14 @@
/*
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include "linux/kernel.h"
-#include "linux/sched.h"
-#include "linux/slab.h"
-#include "linux/list.h"
+#include "linux/irqreturn.h"
#include "linux/kd.h"
-#include "linux/interrupt.h"
-#include "asm/uaccess.h"
#include "chan_kern.h"
+#include "irq_kern.h"
#include "irq_user.h"
-#include "line.h"
-#include "kern.h"
-#include "kern_util.h"
#include "os.h"
-#include "irq_kern.h"
#define LINE_BUFSIZE 4096
@@ -35,12 +27,13 @@ static void line_timer_cb(struct work_struct *work)
{
struct line *line = container_of(work, struct line, task.work);
- if(!line->throttled)
+ if (!line->throttled)
chan_interrupt(&line->chan_list, &line->task, line->tty,
line->driver->read_irq);
}
-/* Returns the free space inside the ring buffer of this line.
+/*
+ * Returns the free space inside the ring buffer of this line.
*
* Should be called while holding line->lock (this does not modify datas).
*/
@@ -107,11 +100,12 @@ static int buffer_data(struct line *line, const char *buf, int len)
{
int end, room;
- if(line->buffer == NULL){
+ if (line->buffer == NULL) {
line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
if (line->buffer == NULL) {
- printk("buffer_data - atomic allocation failed\n");
- return(0);
+ printk(KERN_ERR "buffer_data - atomic allocation "
+ "failed\n");
+ return 0;
}
line->head = line->buffer;
line->tail = line->buffer;
@@ -122,7 +116,7 @@ static int buffer_data(struct line *line, const char *buf, int len)
end = line->buffer + LINE_BUFSIZE - line->tail;
- if (len < end){
+ if (len < end) {
memcpy(line->tail, buf, len);
line->tail += len;
}
@@ -162,8 +156,10 @@ static int flush_buffer(struct line *line)
if (n < 0)
return n;
if (n == count) {
- /* We have flushed from ->head to buffer end, now we
- * must flush only from the beginning to ->tail.*/
+ /*
+ * We have flushed from ->head to buffer end, now we
+ * must flush only from the beginning to ->tail.
+ */
line->head = line->buffer;
} else {
line->head += n;
@@ -175,7 +171,7 @@ static int flush_buffer(struct line *line)
n = write_chan(&line->chan_list, line->head, count,
line->driver->write_irq);
- if(n < 0)
+ if (n < 0)
return n;
line->head += n;
@@ -189,19 +185,18 @@ void line_flush_buffer(struct tty_struct *tty)
int err;
/*XXX: copied from line_write, verify if it is correct!*/
- if(tty->stopped)
+ if (tty->stopped)
return;
spin_lock_irqsave(&line->lock, flags);
err = flush_buffer(line);
- /*if (err == 1)
- err = 0;*/
spin_unlock_irqrestore(&line->lock, flags);
- //return err;
}
-/* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer
- * and ->write. Hope it's not that bad.*/
+/*
+ * We map both ->flush_chars and ->put_char (which go in pair) onto
+ * ->flush_buffer and ->write. Hope it's not that bad.
+ */
void line_flush_chars(struct tty_struct *tty)
{
line_flush_buffer(tty);
@@ -216,18 +211,15 @@ int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
{
struct line *line = tty->driver_data;
unsigned long flags;
- int n, err, ret = 0;
+ int n, ret = 0;
- if(tty->stopped)
+ if (tty->stopped)
return 0;
spin_lock_irqsave(&line->lock, flags);
- if (line->head != line->tail) {
+ if (line->head != line->tail)
ret = buffer_data(line, buf, len);
- err = flush_buffer(line);
- if (err <= 0 && (err != -EAGAIN || !ret))
- ret = err;
- } else {
+ else {
n = write_chan(&line->chan_list, buf, len,
line->driver->write_irq);
if (n < 0) {
@@ -257,17 +249,17 @@ static const struct {
} tty_ioctls[] = {
/* don't print these, they flood the log ... */
{ TCGETS, NULL, "TCGETS" },
- { TCSETS, NULL, "TCSETS" },
- { TCSETSW, NULL, "TCSETSW" },
- { TCFLSH, NULL, "TCFLSH" },
- { TCSBRK, NULL, "TCSBRK" },
+ { TCSETS, NULL, "TCSETS" },
+ { TCSETSW, NULL, "TCSETSW" },
+ { TCFLSH, NULL, "TCFLSH" },
+ { TCSBRK, NULL, "TCSBRK" },
/* general tty stuff */
- { TCSETSF, KERN_DEBUG, "TCSETSF" },
- { TCGETA, KERN_DEBUG, "TCGETA" },
- { TIOCMGET, KERN_DEBUG, "TIOCMGET" },
- { TCSBRKP, KERN_DEBUG, "TCSBRKP" },
- { TIOCMSET, KERN_DEBUG, "TIOCMSET" },
+ { TCSETSF, KERN_DEBUG, "TCSETSF" },
+ { TCGETA, KERN_DEBUG, "TCGETA" },
+ { TIOCMGET, KERN_DEBUG, "TIOCMGET" },
+ { TCSBRKP, KERN_DEBUG, "TCSBRKP" },
+ { TIOCMSET, KERN_DEBUG, "TIOCMSET" },
/* linux-specific ones */
{ TIOCLINUX, KERN_INFO, "TIOCLINUX" },
@@ -324,12 +316,7 @@ int line_ioctl(struct tty_struct *tty, struct file * file,
for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
if (cmd == tty_ioctls[i].cmd)
break;
- if (i < ARRAY_SIZE(tty_ioctls)) {
- if (NULL != tty_ioctls[i].level)
- printk("%s%s: %s: ioctl %s called\n",
- tty_ioctls[i].level, __FUNCTION__,
- tty->name, tty_ioctls[i].name);
- } else {
+ if (i == ARRAY_SIZE(tty_ioctls)) {
printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
__FUNCTION__, tty->name, cmd);
}
@@ -355,11 +342,12 @@ void line_unthrottle(struct tty_struct *tty)
chan_interrupt(&line->chan_list, &line->task, tty,
line->driver->read_irq);
- /* Maybe there is enough stuff pending that calling the interrupt
+ /*
+ * Maybe there is enough stuff pending that calling the interrupt
* throttles us again. In this case, line->throttled will be 1
* again and we shouldn't turn the interrupt back on.
*/
- if(!line->throttled)
+ if (!line->throttled)
reactivate_chan(&line->chan_list, line->driver->read_irq);
}
@@ -370,27 +358,30 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
struct tty_struct *tty = line->tty;
int err;
- /* Interrupts are disabled here because we registered the interrupt with
- * IRQF_DISABLED (see line_setup_irq).*/
+ /*
+ * Interrupts are disabled here because we registered the interrupt with
+ * IRQF_DISABLED (see line_setup_irq).
+ */
spin_lock(&line->lock);
err = flush_buffer(line);
if (err == 0) {
return IRQ_NONE;
- } else if(err < 0) {
+ } else if (err < 0) {
line->head = line->buffer;
line->tail = line->buffer;
}
spin_unlock(&line->lock);
- if(tty == NULL)
+ if (tty == NULL)
return IRQ_NONE;
if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
(tty->ldisc.write_wakeup != NULL))
(tty->ldisc.write_wakeup)(tty);
- /* BLOCKING mode
+ /*
+ * BLOCKING mode
* In blocking mode, everything sleeps on tty->write_wait.
* Sleeping in the console driver would break non-blocking
* writes.
@@ -420,7 +411,8 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
return err;
}
-/* Normally, a driver like this can rely mostly on the tty layer
+/*
+ * Normally, a driver like this can rely mostly on the tty layer
* locking, particularly when it comes to the driver structure.
* However, in this case, mconsole requests can come in "from the
* side", and race with opens and closes.
@@ -442,11 +434,11 @@ int line_open(struct line *lines, struct tty_struct *tty)
int err = -ENODEV;
spin_lock(&line->count_lock);
- if(!line->valid)
+ if (!line->valid)
goto out_unlock;
err = 0;
- if(tty->count > 1)
+ if (tty->count > 1)
goto out_unlock;
spin_unlock(&line->count_lock);
@@ -460,7 +452,7 @@ int line_open(struct line *lines, struct tty_struct *tty)
INIT_DELAYED_WORK(&line->task, line_timer_cb);
- if(!line->sigio){
+ if (!line->sigio) {
chan_enable_winch(&line->chan_list, tty);
line->sigio = 1;
}
@@ -481,20 +473,21 @@ void line_close(struct tty_struct *tty, struct file * filp)
{
struct line *line = tty->driver_data;
- /* If line_open fails (and tty->driver_data is never set),
+ /*
+ * If line_open fails (and tty->driver_data is never set),
* tty_open will call line_close. So just return in this case.
*/
- if(line == NULL)
+ if (line == NULL)
return;
/* We ignore the error anyway! */
flush_buffer(line);
spin_lock(&line->count_lock);
- if(!line->valid)
+ if (!line->valid)
goto out_unlock;
- if(tty->count > 1)
+ if (tty->count > 1)
goto out_unlock;
spin_unlock(&line->count_lock);
@@ -502,10 +495,10 @@ void line_close(struct tty_struct *tty, struct file * filp)
line->tty = NULL;
tty->driver_data = NULL;
- if(line->sigio){
+ if (line->sigio) {
unregister_winch(tty);
line->sigio = 0;
- }
+ }
return;
@@ -529,12 +522,12 @@ static int setup_one_line(struct line *lines, int n, char *init, int init_prio,
spin_lock(&line->count_lock);
- if(line->tty != NULL){
+ if (line->tty != NULL) {
*error_out = "Device is already open";
goto out;
}
- if (line->init_pri <= init_prio){
+ if (line->init_pri <= init_prio) {
line->init_pri = init_prio;
if (!strcmp(init, "none"))
line->valid = 0;
@@ -549,7 +542,8 @@ out:
return err;
}
-/* Common setup code for both startup command line and mconsole initialization.
+/*
+ * Common setup code for both startup command line and mconsole initialization.
* @lines contains the array (of size @num) to modify;
* @init is the setup string;
* @error_out is an error string in the case of failure;
@@ -561,14 +555,16 @@ int line_setup(struct line *lines, unsigned int num, char *init,
int i, n, err;
char *end;
- if(*init == '=') {
- /* We said con=/ssl= instead of con#=, so we are configuring all
- * consoles at once.*/
+ if (*init == '=') {
+ /*
+ * We said con=/ssl= instead of con#=, so we are configuring all
+ * consoles at once.
+ */
n = -1;
}
else {
n = simple_strtoul(init, &end, 0);
- if(*end != '='){
+ if (*end != '=') {
*error_out = "Couldn't parse device number";
return -EINVAL;
}
@@ -580,16 +576,16 @@ int line_setup(struct line *lines, unsigned int num, char *init,
*error_out = "Device number out of range";
return -EINVAL;
}
- else if (n >= 0){
+ else if (n >= 0) {
err = setup_one_line(lines, n, init, INIT_ONE, error_out);
- if(err)
+ if (err)
return err;
}
else {
- for(i = 0; i < num; i++){
+ for(i = 0; i < num; i++) {
err = setup_one_line(lines, i, init, INIT_ALL,
error_out);
- if(err)
+ if (err)
return err;
}
}
@@ -603,18 +599,18 @@ int line_config(struct line *lines, unsigned int num, char *str,
char *new;
int n;
- if(*str == '='){
+ if (*str == '=') {
*error_out = "Can't configure all devices from mconsole";
return -EINVAL;
}
new = kstrdup(str, GFP_KERNEL);
- if(new == NULL){
+ if (new == NULL) {
*error_out = "Failed to allocate memory";
return -ENOMEM;
}
n = line_setup(lines, num, new, error_out);
- if(n < 0)
+ if (n < 0)
return n;
line = &lines[n];
@@ -629,12 +625,12 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
int dev, n = 0;
dev = simple_strtoul(name, &end, 0);
- if((*end != '\0') || (end == name)){
+ if ((*end != '\0') || (end == name)) {
*error_out = "line_get_config failed to parse device number";
return 0;
}
- if((dev < 0) || (dev >= num)){
+ if ((dev < 0) || (dev >= num)) {
*error_out = "device number out of range";
return 0;
}
@@ -642,9 +638,9 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
line = &lines[dev];
spin_lock(&line->count_lock);
- if(!line->valid)
+ if (!line->valid)
CONFIG_CHUNK(str, size, n, "none", 1);
- else if(line->tty == NULL)
+ else if (line->tty == NULL)
CONFIG_CHUNK(str, size, n, line->init_str, 1);
else n = chan_config_string(&line->chan_list, str, size, error_out);
spin_unlock(&line->count_lock);
@@ -655,16 +651,16 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
int line_id(char **str, int *start_out, int *end_out)
{
char *end;
- int n;
+ int n;
n = simple_strtoul(*str, &end, 0);
- if((*end != '\0') || (end == *str))
- return -1;
+ if ((*end != '\0') || (end == *str))
+ return -1;
- *str = end;
- *start_out = n;
- *end_out = n;
- return n;
+ *str = end;
+ *start_out = n;
+ *end_out = n;
+ return n;
}
int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
@@ -674,7 +670,7 @@ int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
sprintf(config, "%d=none", n);
err = line_setup(lines, num, config, error_out);
- if(err >= 0)
+ if (err >= 0)
err = 0;
return err;
}
@@ -700,14 +696,14 @@ struct tty_driver *register_lines(struct line_driver *line_driver,
tty_set_operations(driver, ops);
if (tty_register_driver(driver)) {
- printk("%s: can't register %s driver\n",
- __FUNCTION__,line_driver->name);
+ printk(KERN_ERR "register_lines : can't register %s driver\n",
+ line_driver->name);
put_tty_driver(driver);
return NULL;
}
- for(i = 0; i < nlines; i++){
- if(!lines[i].valid)
+ for(i = 0; i < nlines; i++) {
+ if (!lines[i].valid)
tty_unregister_device(driver, i);
}
@@ -724,20 +720,20 @@ void lines_init(struct line *lines, int nlines, struct chan_opts *opts)
char *error;
int i;
- for(i = 0; i < nlines; i++){
+ for(i = 0; i < nlines; i++) {
line = &lines[i];
INIT_LIST_HEAD(&line->chan_list);
- if(line->init_str == NULL)
+ if (line->init_str == NULL)
continue;
line->init_str = kstrdup(line->init_str, GFP_KERNEL);
- if(line->init_str == NULL)
- printk("lines_init - kstrdup returned NULL\n");
+ if (line->init_str == NULL)
+ printk(KERN_ERR "lines_init - kstrdup returned NULL\n");
- if(parse_chan_pair(line->init_str, line, i, opts, &error)){
- printk("parse_chan_pair failed for device %d : %s\n",
- i, error);
+ if (parse_chan_pair(line->init_str, line, i, opts, &error)) {
+ printk(KERN_ERR "parse_chan_pair failed for "
+ "device %d : %s\n", i, error);
line->valid = 0;
}
}
@@ -775,14 +771,14 @@ static irqreturn_t winch_interrupt(int irq, void *data)
int err;
char c;
- if(winch->fd != -1){
+ if (winch->fd != -1) {
err = generic_read(winch->fd, &c, NULL);
- if(err < 0){
- if(err != -EAGAIN){
- printk("winch_interrupt : read failed, "
- "errno = %d\n", -err);
- printk("fd %d is losing SIGWINCH support\n",
- winch->tty_fd);
+ if (err < 0) {
+ if (err != -EAGAIN) {
+ printk(KERN_ERR "winch_interrupt : "
+ "read failed, errno = %d\n", -err);
+ printk(KERN_ERR "fd %d is losing SIGWINCH "
+ "support\n", winch->tty_fd);
free_winch(winch, 0);
return IRQ_HANDLED;
}
@@ -797,7 +793,7 @@ static irqreturn_t winch_interrupt(int irq, void *data)
kill_pgrp(tty->pgrp, SIGWINCH, 1);
}
out:
- if(winch->fd != -1)
+ if (winch->fd != -1)
reactivate_fd(winch->fd, WINCH_IRQ);
return IRQ_HANDLED;
}
@@ -809,7 +805,7 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
winch = kmalloc(sizeof(*winch), GFP_KERNEL);
if (winch == NULL) {
- printk("register_winch_irq - kmalloc failed\n");
+ printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
goto cleanup;
}
@@ -823,7 +819,8 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
"winch", winch) < 0) {
- printk("register_winch_irq - failed to register IRQ\n");
+ printk(KERN_ERR "register_winch_irq - failed to register "
+ "IRQ\n");
goto out_free;
}
@@ -849,13 +846,13 @@ static void unregister_winch(struct tty_struct *tty)
spin_lock(&winch_handler_lock);
- list_for_each(ele, &winch_handlers){
+ list_for_each(ele, &winch_handlers) {
winch = list_entry(ele, struct winch, list);
- if(winch->tty == tty){
+ if (winch->tty == tty) {
free_winch(winch, 1);
break;
- }
- }
+ }
+ }
spin_unlock(&winch_handler_lock);
}
@@ -866,7 +863,7 @@ static void winch_cleanup(void)
spin_lock(&winch_handler_lock);
- list_for_each_safe(ele, next, &winch_handlers){
+ list_for_each_safe(ele, next, &winch_handlers) {
winch = list_entry(ele, struct winch, list);
free_winch(winch, 1);
}
@@ -881,13 +878,13 @@ char *add_xterm_umid(char *base)
int len;
umid = get_umid();
- if(*umid == '\0')
+ if (*umid == '\0')
return base;
len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
title = kmalloc(len, GFP_KERNEL);
- if(title == NULL){
- printk("Failed to allocate buffer for xterm title\n");
+ if (title == NULL) {
+ printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
return base;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-11 09:45:57 +0000