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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-04-22 06:28:35 (GMT) |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-04-22 06:28:35 (GMT) |
commit | 57b8628bb0ac4e47c806e45c5bbd89282e93869b (patch) | |
tree | ee9289f0898054474b7e5054abdb3ffb78666436 /drivers/tty/pty.c | |
parent | 486c8aba39e5f194519cd5c0e85e5d1de8b74b03 (diff) | |
parent | 66f75a5d028beaf67c931435fdc3e7823125730c (diff) | |
download | linux-57b8628bb0ac4e47c806e45c5bbd89282e93869b.tar.xz |
Merge commit 'v3.4-rc4' into next
Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r-- | drivers/tty/pty.c | 64 |
1 files changed, 3 insertions, 61 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index d8653ab..eeae7fa 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -21,14 +21,12 @@ #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> #include <linux/devpts_fs.h> #include <linux/slab.h> -#include <asm/system.h> #ifdef CONFIG_UNIX98_PTYS static struct tty_driver *ptm_driver; @@ -394,7 +392,6 @@ 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 +409,6 @@ 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 +435,9 @@ 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 +465,8 @@ 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 +537,6 @@ 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 +550,6 @@ 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 +623,7 @@ 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 +668,6 @@ 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 +686,6 @@ 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 +706,6 @@ 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; |