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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.c94
1 files changed, 64 insertions, 30 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 07c60a233..a1ed3b384 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -109,6 +109,7 @@
#define CON_DRIVER_FLAG_MODULE 1
#define CON_DRIVER_FLAG_INIT 2
#define CON_DRIVER_FLAG_ATTR 4
+#define CON_DRIVER_FLAG_ZOMBIE 8
struct con_driver {
const struct consw *con;
@@ -136,6 +137,7 @@ const struct consw *conswitchp;
*/
#define DEFAULT_BELL_PITCH 750
#define DEFAULT_BELL_DURATION (HZ/8)
+#define DEFAULT_CURSOR_BLINK_MS 200
struct vc vc_cons [MAX_NR_CONSOLES];
@@ -154,6 +156,7 @@ static int set_vesa_blanking(char __user *p);
static void set_cursor(struct vc_data *vc);
static void hide_cursor(struct vc_data *vc);
static void console_callback(struct work_struct *ignored);
+static void con_driver_unregister_callback(struct work_struct *ignored);
static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
@@ -183,6 +186,7 @@ static int blankinterval = 10*60;
core_param(consoleblank, blankinterval, int, 0444);
static DECLARE_WORK(console_work, console_callback);
+static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
/*
* fg_console is the current virtual console,
@@ -739,6 +743,8 @@ static void visual_init(struct vc_data *vc, int num, int init)
__module_get(vc->vc_sw->owner);
vc->vc_num = num;
vc->vc_display_fg = &master_display_fg;
+ if (vc->vc_uni_pagedir_loc)
+ con_free_unimap(vc);
vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
vc->vc_uni_pagedir = NULL;
vc->vc_hi_font_mask = 0;
@@ -1591,6 +1597,13 @@ static void setterm_command(struct vc_data *vc)
case 15: /* activate the previous console */
set_console(last_console);
break;
+ case 16: /* set cursor blink duration in msec */
+ if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
+ vc->vc_par[1] <= USHRT_MAX)
+ vc->vc_cur_blink_ms = vc->vc_par[1];
+ else
+ vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
+ break;
}
}
@@ -1718,6 +1731,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+ vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
gotoxy(vc, 0, 0);
save_cur(vc);
@@ -3233,22 +3247,6 @@ err:
#ifdef CONFIG_VT_HW_CONSOLE_BINDING
-static int con_is_graphics(const struct consw *csw, int first, int last)
-{
- int i, retval = 0;
-
- for (i = first; i <= last; i++) {
- struct vc_data *vc = vc_cons[i].d;
-
- if (vc && vc->vc_mode == KD_GRAPHICS) {
- retval = 1;
- break;
- }
- }
-
- return retval;
-}
-
/* unlocked version of unbind_con_driver() */
int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
{
@@ -3334,8 +3332,7 @@ static int vt_bind(struct con_driver *con)
const struct consw *defcsw = NULL, *csw = NULL;
int i, more = 1, first = -1, last = -1, deflt = 0;
- if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
- con_is_graphics(con->con, con->first, con->last))
+ if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
goto err;
csw = con->con;
@@ -3386,8 +3383,7 @@ static int vt_unbind(struct con_driver *con)
int i, more = 1, first = -1, last = -1, deflt = 0;
int ret;
- if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
- con_is_graphics(con->con, con->first, con->last))
+ if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
goto err;
csw = con->con;
@@ -3637,7 +3633,8 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
- if (con_driver->con == NULL) {
+ if (con_driver->con == NULL &&
+ !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
con_driver->con = csw;
con_driver->desc = desc;
con_driver->node = i;
@@ -3699,16 +3696,20 @@ int do_unregister_con_driver(const struct consw *csw)
struct con_driver *con_driver = &registered_con_driver[i];
if (con_driver->con == csw) {
- vtconsole_deinit_device(con_driver);
- device_destroy(vtconsole_class,
- MKDEV(0, con_driver->node));
+ /*
+ * Defer the removal of the sysfs entries since that
+ * will acquire the kernfs s_active lock and we can't
+ * acquire this lock while holding the console lock:
+ * the unbind sysfs entry imposes already the opposite
+ * order. Reset con already here to prevent any later
+ * lookup to succeed and mark this slot as zombie, so
+ * it won't get reused until we complete the removal
+ * in the deferred work.
+ */
con_driver->con = NULL;
- con_driver->desc = NULL;
- con_driver->dev = NULL;
- con_driver->node = 0;
- con_driver->flag = 0;
- con_driver->first = 0;
- con_driver->last = 0;
+ con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
+ schedule_work(&con_driver_unregister_work);
+
return 0;
}
}
@@ -3717,6 +3718,39 @@ int do_unregister_con_driver(const struct consw *csw)
}
EXPORT_SYMBOL_GPL(do_unregister_con_driver);
+static void con_driver_unregister_callback(struct work_struct *ignored)
+{
+ int i;
+
+ console_lock();
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con_driver = &registered_con_driver[i];
+
+ if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
+ continue;
+
+ console_unlock();
+
+ vtconsole_deinit_device(con_driver);
+ device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
+
+ console_lock();
+
+ if (WARN_ON_ONCE(con_driver->con))
+ con_driver->con = NULL;
+ con_driver->desc = NULL;
+ con_driver->dev = NULL;
+ con_driver->node = 0;
+ WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
+ con_driver->flag = 0;
+ con_driver->first = 0;
+ con_driver->last = 0;
+ }
+
+ console_unlock();
+}
+
/*
* If we support more console drivers, this function is used
* when a driver wants to take over some existing consoles
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-11 21:15:40 +0000