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path: root/drivers/tty/pty.c
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Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r--drivers/tty/pty.c63
1 files changed, 3 insertions, 60 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index d8653ab6f498..f96ecaec24f8 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -21,7 +21,6 @@
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/init.h>
-#include <linux/sysctl.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/bitops.h>
@@ -394,7 +393,6 @@ static void __init legacy_pty_init(void)
if (!pty_slave_driver)
panic("Couldn't allocate pty slave driver");
- pty_driver->owner = THIS_MODULE;
pty_driver->driver_name = "pty_master";
pty_driver->name = "pty";
pty_driver->major = PTY_MASTER_MAJOR;
@@ -412,7 +410,6 @@ static void __init legacy_pty_init(void)
pty_driver->other = pty_slave_driver;
tty_set_operations(pty_driver, &master_pty_ops_bsd);
- pty_slave_driver->owner = THIS_MODULE;
pty_slave_driver->driver_name = "pty_slave";
pty_slave_driver->name = "ttyp";
pty_slave_driver->major = PTY_SLAVE_MAJOR;
@@ -439,55 +436,9 @@ static inline void legacy_pty_init(void) { }
/* Unix98 devices */
#ifdef CONFIG_UNIX98_PTYS
-/*
- * sysctl support for setting limits on the number of Unix98 ptys allocated.
- * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
- */
-int pty_limit = NR_UNIX98_PTY_DEFAULT;
-static int pty_limit_min;
-static int pty_limit_max = NR_UNIX98_PTY_MAX;
-static int pty_count;
static struct cdev ptmx_cdev;
-static struct ctl_table pty_table[] = {
- {
- .procname = "max",
- .maxlen = sizeof(int),
- .mode = 0644,
- .data = &pty_limit,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &pty_limit_min,
- .extra2 = &pty_limit_max,
- }, {
- .procname = "nr",
- .maxlen = sizeof(int),
- .mode = 0444,
- .data = &pty_count,
- .proc_handler = proc_dointvec,
- },
- {}
-};
-
-static struct ctl_table pty_kern_table[] = {
- {
- .procname = "pty",
- .mode = 0555,
- .child = pty_table,
- },
- {}
-};
-
-static struct ctl_table pty_root_table[] = {
- {
- .procname = "kernel",
- .mode = 0555,
- .child = pty_kern_table,
- },
- {}
-};
-
-
static int pty_unix98_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@@ -515,10 +466,8 @@ static int pty_unix98_ioctl(struct tty_struct *tty,
static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
struct inode *ptm_inode, int idx)
{
- struct tty_struct *tty = devpts_get_tty(ptm_inode, idx);
- if (tty)
- tty = tty->link;
- return tty;
+ /* Master must be open via /dev/ptmx */
+ return ERR_PTR(-EIO);
}
/**
@@ -589,7 +538,6 @@ static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
*/
tty_driver_kref_get(driver);
tty->count++;
- pty_count++;
return 0;
err_free_mem:
deinitialize_tty_struct(o_tty);
@@ -603,7 +551,6 @@ err_free_tty:
static void ptm_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
{
- pty_count--;
}
static void pts_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
@@ -677,7 +624,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
mutex_lock(&tty_mutex);
tty_lock();
- tty = tty_init_dev(ptm_driver, index, 1);
+ tty = tty_init_dev(ptm_driver, index);
mutex_unlock(&tty_mutex);
if (IS_ERR(tty)) {
@@ -722,7 +669,6 @@ static void __init unix98_pty_init(void)
if (!pts_driver)
panic("Couldn't allocate Unix98 pts driver");
- ptm_driver->owner = THIS_MODULE;
ptm_driver->driver_name = "pty_master";
ptm_driver->name = "ptm";
ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
@@ -741,7 +687,6 @@ static void __init unix98_pty_init(void)
ptm_driver->other = pts_driver;
tty_set_operations(ptm_driver, &ptm_unix98_ops);
- pts_driver->owner = THIS_MODULE;
pts_driver->driver_name = "pty_slave";
pts_driver->name = "pts";
pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
@@ -762,8 +707,6 @@ static void __init unix98_pty_init(void)
if (tty_register_driver(pts_driver))
panic("Couldn't register Unix98 pts driver");
- register_sysctl_table(pty_root_table);
-
/* Now create the /dev/ptmx special device */
tty_default_fops(&ptmx_fops);
ptmx_fops.open = ptmx_open;