PTY: add kernel parameter to overwrite legacy pty count

[linux-2.6-omap-h63xx.git] / drivers / char / pty.c

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 49f3997fd251d95cfaec443d98f5a15037f52c68..73de77105fea9c9a58c8ed704fab7626b2bfb2d1 100644 (file)
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -11,11 +11,9 @@
  *
  */
 
-#include <linux/config.h>
 #include <linux/module.h>      /* For EXPORT_SYMBOL */
 
 #include <linux/errno.h>
-#include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
@@ -24,7 +22,6 @@
 #include <linux/major.h>
 #include <linux/mm.h>
 #include <linux/init.h>
-#include <linux/devfs_fs_kernel.h>
 #include <linux/sysctl.h>
 
 #include <asm/uaccess.h>
@@ -101,7 +98,7 @@ static void pty_unthrottle(struct tty_struct * tty)
  *
  * FIXME: Our pty_write method is called with our ldisc lock held but
  * not our partners. We can't just take the other one blindly without
- * risking deadlocks.  There is also the small matter of TTY_DONT_FLIP
+ * risking deadlocks.
  */
 static int pty_write(struct tty_struct * tty, const unsigned char *buf, int count)
 {
@@ -111,7 +108,7 @@ static int pty_write(struct tty_struct * tty, const unsigned char *buf, int coun
        if (!to || tty->stopped)
                return 0;
 
-       c = to->ldisc.receive_room(to);
+       c = to->receive_room;
        if (c > count)
                c = count;
        to->ldisc.receive_buf(to, buf, NULL, c);
@@ -126,7 +123,7 @@ static int pty_write_room(struct tty_struct *tty)
        if (!to || tty->stopped)
                return 0;
 
-       return to->ldisc.receive_room(to);
+       return to->receive_room;
 }
 
 /*
@@ -220,13 +217,13 @@ out:
        return retval;
 }
 
-static void pty_set_termios(struct tty_struct *tty, struct termios *old_termios)
+static void pty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 {
         tty->termios->c_cflag &= ~(CSIZE | PARENB);
         tty->termios->c_cflag |= (CS8 | CREAD);
 }
 
-static struct tty_operations pty_ops = {
+static const struct tty_operations pty_ops = {
        .open = pty_open,
        .close = pty_close,
        .write = pty_write,
@@ -251,21 +248,25 @@ static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
        return -ENOIOCTLCMD;
 }
 
+static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
+module_param(legacy_count, int, 0);
+
 static void __init legacy_pty_init(void)
 {
+       if (legacy_count <= 0)
+               return;
 
-       pty_driver = alloc_tty_driver(NR_PTYS);
+       pty_driver = alloc_tty_driver(legacy_count);
        if (!pty_driver)
                panic("Couldn't allocate pty driver");
 
-       pty_slave_driver = alloc_tty_driver(NR_PTYS);
+       pty_slave_driver = alloc_tty_driver(legacy_count);
        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->devfs_name = "pty/m";
        pty_driver->major = PTY_MASTER_MAJOR;
        pty_driver->minor_start = 0;
        pty_driver->type = TTY_DRIVER_TYPE_PTY;
@@ -275,6 +276,8 @@ static void __init legacy_pty_init(void)
        pty_driver->init_termios.c_oflag = 0;
        pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
        pty_driver->init_termios.c_lflag = 0;
+       pty_driver->init_termios.c_ispeed = 38400;
+       pty_driver->init_termios.c_ospeed = 38400;
        pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW;
        pty_driver->other = pty_slave_driver;
        tty_set_operations(pty_driver, &pty_ops);
@@ -283,13 +286,14 @@ static void __init legacy_pty_init(void)
        pty_slave_driver->owner = THIS_MODULE;
        pty_slave_driver->driver_name = "pty_slave";
        pty_slave_driver->name = "ttyp";
-       pty_slave_driver->devfs_name = "pty/s";
        pty_slave_driver->major = PTY_SLAVE_MAJOR;
        pty_slave_driver->minor_start = 0;
        pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
        pty_slave_driver->subtype = PTY_TYPE_SLAVE;
        pty_slave_driver->init_termios = tty_std_termios;
        pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+       pty_slave_driver->init_termios.c_ispeed = 38400;
+       pty_slave_driver->init_termios.c_ospeed = 38400;
        pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS |
                                        TTY_DRIVER_REAL_RAW;
        pty_slave_driver->other = pty_driver;
@@ -351,7 +355,6 @@ static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
 
 static void __init unix98_pty_init(void)
 {
-       devfs_mk_dir("pts");
        ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
        if (!ptm_driver)
                panic("Couldn't allocate Unix98 ptm driver");
@@ -371,8 +374,10 @@ static void __init unix98_pty_init(void)
        ptm_driver->init_termios.c_oflag = 0;
        ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
        ptm_driver->init_termios.c_lflag = 0;
+       ptm_driver->init_termios.c_ispeed = 38400;
+       ptm_driver->init_termios.c_ospeed = 38400;
        ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
-               TTY_DRIVER_NO_DEVFS | TTY_DRIVER_DEVPTS_MEM;
+               TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
        ptm_driver->other = pts_driver;
        tty_set_operations(ptm_driver, &pty_ops);
        ptm_driver->ioctl = pty_unix98_ioctl;
@@ -386,8 +391,10 @@ static void __init unix98_pty_init(void)
        pts_driver->subtype = PTY_TYPE_SLAVE;
        pts_driver->init_termios = tty_std_termios;
        pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+       pts_driver->init_termios.c_ispeed = 38400;
+       pts_driver->init_termios.c_ospeed = 38400;
        pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
-               TTY_DRIVER_NO_DEVFS | TTY_DRIVER_DEVPTS_MEM;
+               TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
        pts_driver->other = ptm_driver;
        tty_set_operations(pts_driver, &pty_ops);