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path: root/drivers/tty/vt/vt.c
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Diffstat (limited to 'drivers/tty/vt/vt.c')
-rw-r--r--drivers/tty/vt/vt.c135
1 files changed, 70 insertions, 65 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 76407eca9ab0..147ede3423df 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1003,9 +1003,9 @@ static int vt_resize(struct tty_struct *tty, struct winsize *ws)
struct vc_data *vc = tty->driver_data;
int ret;
- acquire_console_sem();
+ console_lock();
ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
- release_console_sem();
+ console_unlock();
return ret;
}
@@ -1271,7 +1271,7 @@ static void default_attr(struct vc_data *vc)
vc->vc_color = vc->vc_def_color;
}
-/* console_sem is held */
+/* console_lock is held */
static void csi_m(struct vc_data *vc)
{
int i;
@@ -1415,7 +1415,7 @@ int mouse_reporting(void)
return vc_cons[fg_console].d->vc_report_mouse;
}
-/* console_sem is held */
+/* console_lock is held */
static void set_mode(struct vc_data *vc, int on_off)
{
int i;
@@ -1485,7 +1485,7 @@ static void set_mode(struct vc_data *vc, int on_off)
}
}
-/* console_sem is held */
+/* console_lock is held */
static void setterm_command(struct vc_data *vc)
{
switch(vc->vc_par[0]) {
@@ -1545,7 +1545,7 @@ static void setterm_command(struct vc_data *vc)
}
}
-/* console_sem is held */
+/* console_lock is held */
static void csi_at(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
@@ -1555,7 +1555,7 @@ static void csi_at(struct vc_data *vc, unsigned int nr)
insert_char(vc, nr);
}
-/* console_sem is held */
+/* console_lock is held */
static void csi_L(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
@@ -1566,7 +1566,7 @@ static void csi_L(struct vc_data *vc, unsigned int nr)
vc->vc_need_wrap = 0;
}
-/* console_sem is held */
+/* console_lock is held */
static void csi_P(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
@@ -1576,7 +1576,7 @@ static void csi_P(struct vc_data *vc, unsigned int nr)
delete_char(vc, nr);
}
-/* console_sem is held */
+/* console_lock is held */
static void csi_M(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
@@ -1587,7 +1587,7 @@ static void csi_M(struct vc_data *vc, unsigned int nr)
vc->vc_need_wrap = 0;
}
-/* console_sem is held (except via vc_init->reset_terminal */
+/* console_lock is held (except via vc_init->reset_terminal */
static void save_cur(struct vc_data *vc)
{
vc->vc_saved_x = vc->vc_x;
@@ -1603,7 +1603,7 @@ static void save_cur(struct vc_data *vc)
vc->vc_saved_G1 = vc->vc_G1_charset;
}
-/* console_sem is held */
+/* console_lock is held */
static void restore_cur(struct vc_data *vc)
{
gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
@@ -1625,7 +1625,7 @@ enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
ESpalette };
-/* console_sem is held (except via vc_init()) */
+/* console_lock is held (except via vc_init()) */
static void reset_terminal(struct vc_data *vc, int do_clear)
{
vc->vc_top = 0;
@@ -1685,7 +1685,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
csi_J(vc, 2);
}
-/* console_sem is held */
+/* console_lock is held */
static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
{
/*
@@ -2119,7 +2119,7 @@ static int is_double_width(uint32_t ucs)
return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
}
-/* acquires console_sem */
+/* acquires console_lock */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
#ifdef VT_BUF_VRAM_ONLY
@@ -2147,11 +2147,11 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
might_sleep();
- acquire_console_sem();
+ console_lock();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
- release_console_sem();
+ console_unlock();
return 0;
}
@@ -2159,7 +2159,7 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
if (!vc_cons_allocated(currcons)) {
/* could this happen? */
printk_once("con_write: tty %d not allocated\n", currcons+1);
- release_console_sem();
+ console_unlock();
return 0;
}
@@ -2375,7 +2375,7 @@ rescan_last_byte:
}
FLUSH
console_conditional_schedule();
- release_console_sem();
+ console_unlock();
notify_update(vc);
return n;
#undef FLUSH
@@ -2388,11 +2388,11 @@ rescan_last_byte:
* us to do the switches asynchronously (needed when we want
* to switch due to a keyboard interrupt). Synchronization
* with other console code and prevention of re-entrancy is
- * ensured with console_sem.
+ * ensured with console_lock.
*/
static void console_callback(struct work_struct *ignored)
{
- acquire_console_sem();
+ console_lock();
if (want_console >= 0) {
if (want_console != fg_console &&
@@ -2422,7 +2422,7 @@ static void console_callback(struct work_struct *ignored)
}
notify_update(vc_cons[fg_console].d);
- release_console_sem();
+ console_unlock();
}
int set_console(int nr)
@@ -2603,7 +2603,7 @@ static struct console vt_console_driver = {
*/
/*
- * Generally a bit racy with respect to console_sem().
+ * Generally a bit racy with respect to console_lock();.
*
* There are some functions which don't need it.
*
@@ -2629,17 +2629,17 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
switch (type)
{
case TIOCL_SETSEL:
- acquire_console_sem();
+ console_lock();
ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
- release_console_sem();
+ console_unlock();
break;
case TIOCL_PASTESEL:
ret = paste_selection(tty);
break;
case TIOCL_UNBLANKSCREEN:
- acquire_console_sem();
+ console_lock();
unblank_screen();
- release_console_sem();
+ console_unlock();
break;
case TIOCL_SELLOADLUT:
ret = sel_loadlut(p);
@@ -2688,10 +2688,10 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
}
break;
case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
- acquire_console_sem();
+ console_lock();
ignore_poke = 1;
do_blank_screen(0);
- release_console_sem();
+ console_unlock();
break;
case TIOCL_BLANKEDSCREEN:
ret = console_blanked;
@@ -2790,11 +2790,11 @@ static void con_flush_chars(struct tty_struct *tty)
return;
/* if we race with con_close(), vt may be null */
- acquire_console_sem();
+ console_lock();
vc = tty->driver_data;
if (vc)
set_cursor(vc);
- release_console_sem();
+ console_unlock();
}
/*
@@ -2805,7 +2805,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
unsigned int currcons = tty->index;
int ret = 0;
- acquire_console_sem();
+ console_lock();
if (tty->driver_data == NULL) {
ret = vc_allocate(currcons);
if (ret == 0) {
@@ -2813,7 +2813,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
/* Still being freed */
if (vc->port.tty) {
- release_console_sem();
+ console_unlock();
return -ERESTARTSYS;
}
tty->driver_data = vc;
@@ -2827,11 +2827,11 @@ static int con_open(struct tty_struct *tty, struct file *filp)
tty->termios->c_iflag |= IUTF8;
else
tty->termios->c_iflag &= ~IUTF8;
- release_console_sem();
+ console_unlock();
return ret;
}
}
- release_console_sem();
+ console_unlock();
return ret;
}
@@ -2844,9 +2844,9 @@ static void con_shutdown(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
BUG_ON(vc == NULL);
- acquire_console_sem();
+ console_lock();
vc->port.tty = NULL;
- release_console_sem();
+ console_unlock();
tty_shutdown(tty);
}
@@ -2893,13 +2893,13 @@ static int __init con_init(void)
struct vc_data *vc;
unsigned int currcons = 0, i;
- acquire_console_sem();
+ console_lock();
if (conswitchp)
display_desc = conswitchp->con_startup();
if (!display_desc) {
fg_console = 0;
- release_console_sem();
+ console_unlock();
return 0;
}
@@ -2946,7 +2946,7 @@ static int __init con_init(void)
printable = 1;
printk("\n");
- release_console_sem();
+ console_unlock();
#ifdef CONFIG_VT_CONSOLE
register_console(&vt_console_driver);
@@ -2994,7 +2994,7 @@ int __init vty_init(const struct file_operations *console_fops)
if (IS_ERR(tty0dev))
tty0dev = NULL;
else
- device_create_file(tty0dev, &dev_attr_active);
+ WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
vcs_init();
@@ -3037,7 +3037,7 @@ static int bind_con_driver(const struct consw *csw, int first, int last,
if (!try_module_get(owner))
return -ENODEV;
- acquire_console_sem();
+ console_lock();
/* check if driver is registered */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
@@ -3122,7 +3122,7 @@ static int bind_con_driver(const struct consw *csw, int first, int last,
retval = 0;
err:
- release_console_sem();
+ console_unlock();
module_put(owner);
return retval;
};
@@ -3171,7 +3171,7 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
if (!try_module_get(owner))
return -ENODEV;
- acquire_console_sem();
+ console_lock();
/* check if driver is registered and if it is unbindable */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
@@ -3185,7 +3185,7 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
}
if (retval) {
- release_console_sem();
+ console_unlock();
goto err;
}
@@ -3204,12 +3204,12 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
}
if (retval) {
- release_console_sem();
+ console_unlock();
goto err;
}
if (!con_is_bound(csw)) {
- release_console_sem();
+ console_unlock();
goto err;
}
@@ -3238,7 +3238,7 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
if (!con_is_bound(csw))
con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
- release_console_sem();
+ console_unlock();
/* ignore return value, binding should not fail */
bind_con_driver(defcsw, first, last, deflt);
err:
@@ -3538,14 +3538,14 @@ int register_con_driver(const struct consw *csw, int first, int last)
if (!try_module_get(owner))
return -ENODEV;
- acquire_console_sem();
+ console_lock();
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
/* already registered */
if (con_driver->con == csw)
- retval = -EINVAL;
+ retval = -EBUSY;
}
if (retval)
@@ -3592,7 +3592,7 @@ int register_con_driver(const struct consw *csw, int first, int last)
}
err:
- release_console_sem();
+ console_unlock();
module_put(owner);
return retval;
}
@@ -3613,7 +3613,7 @@ int unregister_con_driver(const struct consw *csw)
{
int i, retval = -ENODEV;
- acquire_console_sem();
+ console_lock();
/* cannot unregister a bound driver */
if (con_is_bound(csw))
@@ -3639,7 +3639,7 @@ int unregister_con_driver(const struct consw *csw)
}
}
err:
- release_console_sem();
+ console_unlock();
return retval;
}
EXPORT_SYMBOL(unregister_con_driver);
@@ -3656,7 +3656,12 @@ int take_over_console(const struct consw *csw, int first, int last, int deflt)
int err;
err = register_con_driver(csw, first, last);
-
+ /* if we get an busy error we still want to bind the console driver
+ * and return success, as we may have unbound the console driver
+  * but not unregistered it.
+ */
+ if (err == -EBUSY)
+ err = 0;
if (!err)
bind_con_driver(csw, first, last, deflt);
@@ -3934,9 +3939,9 @@ int con_set_cmap(unsigned char __user *arg)
{
int rc;
- acquire_console_sem();
+ console_lock();
rc = set_get_cmap (arg,1);
- release_console_sem();
+ console_unlock();
return rc;
}
@@ -3945,9 +3950,9 @@ int con_get_cmap(unsigned char __user *arg)
{
int rc;
- acquire_console_sem();
+ console_lock();
rc = set_get_cmap (arg,0);
- release_console_sem();
+ console_unlock();
return rc;
}
@@ -3994,12 +3999,12 @@ static int con_font_get(struct vc_data *vc, struct console_font_op *op)
} else
font.data = NULL;
- acquire_console_sem();
+ console_lock();
if (vc->vc_sw->con_font_get)
rc = vc->vc_sw->con_font_get(vc, &font);
else
rc = -ENOSYS;
- release_console_sem();
+ console_unlock();
if (rc)
goto out;
@@ -4076,12 +4081,12 @@ static int con_font_set(struct vc_data *vc, struct console_font_op *op)
font.data = memdup_user(op->data, size);
if (IS_ERR(font.data))
return PTR_ERR(font.data);
- acquire_console_sem();
+ console_lock();
if (vc->vc_sw->con_font_set)
rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
else
rc = -ENOSYS;
- release_console_sem();
+ console_unlock();
kfree(font.data);
return rc;
}
@@ -4103,12 +4108,12 @@ static int con_font_default(struct vc_data *vc, struct console_font_op *op)
else
name[MAX_FONT_NAME - 1] = 0;
- acquire_console_sem();
+ console_lock();
if (vc->vc_sw->con_font_default)
rc = vc->vc_sw->con_font_default(vc, &font, s);
else
rc = -ENOSYS;
- release_console_sem();
+ console_unlock();
if (!rc) {
op->width = font.width;
op->height = font.height;
@@ -4124,7 +4129,7 @@ static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
- acquire_console_sem();
+ console_lock();
if (!vc->vc_sw->con_font_copy)
rc = -ENOSYS;
else if (con < 0 || !vc_cons_allocated(con))
@@ -4133,7 +4138,7 @@ static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
rc = 0;
else
rc = vc->vc_sw->con_font_copy(vc, con);
- release_console_sem();
+ console_unlock();
return rc;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 20:45:00 +0000