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-rw-r--r--drivers/char/pty.c15
-rw-r--r--drivers/char/tty_io.c49
-rw-r--r--drivers/char/vt.c34
-rw-r--r--include/linux/tty.h3
-rw-r--r--include/linux/tty_driver.h6
5 files changed, 65 insertions, 42 deletions
diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 76b27932d22..ec09c1cd4fe 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -388,7 +388,14 @@ static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
return -ENOIOCTLCMD;
}
-static const struct tty_operations pty_unix98_ops = {
+static void pty_shutdown(struct tty_struct *tty)
+{
+ /* We have our own method as we don't use the tty index */
+ kfree(tty->termios);
+ kfree(tty->termios_locked);
+}
+
+static const struct tty_operations ptm_unix98_ops = {
.open = pty_open,
.close = pty_close,
.write = pty_write,
@@ -397,10 +404,10 @@ static const struct tty_operations pty_unix98_ops = {
.chars_in_buffer = pty_chars_in_buffer,
.unthrottle = pty_unthrottle,
.set_termios = pty_set_termios,
- .ioctl = pty_unix98_ioctl
+ .ioctl = pty_unix98_ioctl,
+ .shutdown = pty_shutdown
};
-
static void __init unix98_pty_init(void)
{
ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
@@ -427,7 +434,7 @@ static void __init unix98_pty_init(void)
ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
ptm_driver->other = pts_driver;
- tty_set_operations(ptm_driver, &pty_unix98_ops);
+ tty_set_operations(ptm_driver, &ptm_unix98_ops);
pts_driver->owner = THIS_MODULE;
pts_driver->driver_name = "pty_slave";
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 2e96ce0fddc..f91704d57a4 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1482,6 +1482,31 @@ release_mem_out:
goto end_init;
}
+void tty_free_termios(struct tty_struct *tty)
+{
+ struct ktermios *tp;
+ int idx = tty->index;
+ /* Kill this flag and push into drivers for locking etc */
+ if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) {
+ /* FIXME: Locking on ->termios array */
+ tp = tty->termios;
+ tty->driver->termios[idx] = NULL;
+ kfree(tp);
+
+ tp = tty->termios_locked;
+ tty->driver->termios_locked[idx] = NULL;
+ kfree(tp);
+ }
+}
+EXPORT_SYMBOL(tty_free_termios);
+
+void tty_shutdown(struct tty_struct *tty)
+{
+ tty->driver->ttys[tty->index] = NULL;
+ tty_free_termios(tty);
+}
+EXPORT_SYMBOL(tty_shutdown);
+
/**
* release_one_tty - release tty structure memory
* @kref: kref of tty we are obliterating
@@ -1499,27 +1524,11 @@ static void release_one_tty(struct kref *kref)
{
struct tty_struct *tty = container_of(kref, struct tty_struct, kref);
struct tty_driver *driver = tty->driver;
- int devpts = tty->driver->flags & TTY_DRIVER_DEVPTS_MEM;
- struct ktermios *tp;
- int idx = tty->index;
-
- if (!devpts)
- tty->driver->ttys[idx] = NULL;
-
- if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) {
- /* FIXME: Locking on ->termios array */
- tp = tty->termios;
- if (!devpts)
- tty->driver->termios[idx] = NULL;
- kfree(tp);
-
- tp = tty->termios_locked;
- if (!devpts)
- tty->driver->termios_locked[idx] = NULL;
- kfree(tp);
- }
-
+ if (tty->ops->shutdown)
+ tty->ops->shutdown(tty);
+ else
+ tty_shutdown(tty);
tty->magic = 0;
/* FIXME: locking on tty->driver->refcount */
tty->driver->refcount--;
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index ec94521c311..37a45db5bae 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2758,6 +2758,12 @@ static int con_open(struct tty_struct *tty, struct file *filp)
ret = vc_allocate(currcons);
if (ret == 0) {
struct vc_data *vc = vc_cons[currcons].d;
+
+ /* Still being freed */
+ if (vc->vc_tty) {
+ release_console_sem();
+ return -ERESTARTSYS;
+ }
tty->driver_data = vc;
vc->vc_tty = tty;
@@ -2787,25 +2793,18 @@ static int con_open(struct tty_struct *tty, struct file *filp)
*/
static void con_close(struct tty_struct *tty, struct file *filp)
{
- mutex_lock(&tty_mutex);
- acquire_console_sem();
- if (tty && tty->count == 1) {
- struct vc_data *vc = tty->driver_data;
+ /* Nothing to do - we defer to shutdown */
+}
- if (vc)
- vc->vc_tty = NULL;
- tty->driver_data = NULL;
- vcs_remove_sysfs(tty);
- release_console_sem();
- mutex_unlock(&tty_mutex);
- /*
- * tty_mutex is released, but we still hold BKL, so there is
- * still exclusion against init_dev()
- */
- return;
- }
+static void con_shutdown(struct tty_struct *tty)
+{
+ struct vc_data *vc = tty->driver_data;
+ BUG_ON(vc == NULL);
+ acquire_console_sem();
+ vc->vc_tty = NULL;
+ vcs_remove_sysfs(tty);
release_console_sem();
- mutex_unlock(&tty_mutex);
+ tty_shutdown(tty);
}
static int default_italic_color = 2; // green (ASCII)
@@ -2930,6 +2929,7 @@ static const struct tty_operations con_ops = {
.throttle = con_throttle,
.unthrottle = con_unthrottle,
.resize = vt_resize,
+ .shutdown = con_shutdown
};
int __init vty_init(void)
diff --git a/include/linux/tty.h b/include/linux/tty.h
index e00393a3d1c..6e39c705b9b 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -354,7 +354,8 @@ extern void tty_throttle(struct tty_struct *tty);
extern void tty_unthrottle(struct tty_struct *tty);
extern int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
struct winsize *ws);
-
+extern void tty_shutdown(struct tty_struct *tty);
+extern void tty_free_termios(struct tty_struct *tty);
extern int is_current_pgrp_orphaned(void);
extern struct pid *tty_get_pgrp(struct tty_struct *tty);
extern int is_ignored(int sig);
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index ac6e58e26b7..2322313a858 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -21,6 +21,11 @@
*
* Required method.
*
+ * void (*shutdown)(struct tty_struct * tty);
+ *
+ * This routine is called when a particular tty device is closed for
+ * the last time freeing up the resources.
+ *
* int (*write)(struct tty_struct * tty,
* const unsigned char *buf, int count);
*
@@ -200,6 +205,7 @@ struct tty_driver;
struct tty_operations {
int (*open)(struct tty_struct * tty, struct file * filp);
void (*close)(struct tty_struct * tty, struct file * filp);
+ void (*shutdown)(struct tty_struct *tty);
int (*write)(struct tty_struct * tty,
const unsigned char *buf, int count);
int (*put_char)(struct tty_struct *tty, unsigned char ch);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 02:57:33 +0000