diff options
Diffstat (limited to 'include/linux/tty.h')
| -rw-r--r-- | include/linux/tty.h | 65 |
1 files changed, 44 insertions, 21 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index d6f05292e45..5dbb3cb05a8 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -5,24 +5,6 @@ * 'tty.h' defines some structures used by tty_io.c and some defines. */ -#ifdef __KERNEL__ -#include <linux/fs.h> -#include <linux/major.h> -#include <linux/termios.h> -#include <linux/workqueue.h> -#include <linux/tty_driver.h> -#include <linux/tty_ldisc.h> -#include <linux/mutex.h> - -#include <asm/system.h> - - -/* - * (Note: the *_driver.minor_start values 1, 64, 128, 192 are - * hardcoded at present.) - */ -#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ -#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ #define NR_LDISCS 30 /* line disciplines */ @@ -53,6 +35,25 @@ #define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */ #define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */ +#ifdef __KERNEL__ +#include <linux/fs.h> +#include <linux/major.h> +#include <linux/termios.h> +#include <linux/workqueue.h> +#include <linux/tty_driver.h> +#include <linux/tty_ldisc.h> +#include <linux/mutex.h> + +#include <asm/system.h> + + +/* + * (Note: the *_driver.minor_start values 1, 64, 128, 192 are + * hardcoded at present.) + */ +#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ +#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ + /* * This character is the same as _POSIX_VDISABLE: it cannot be used as * a c_cc[] character, but indicates that a particular special character @@ -420,6 +421,8 @@ extern void tty_driver_flush_buffer(struct tty_struct *tty); 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 winsize *ws); +extern void tty_driver_remove_tty(struct tty_driver *driver, + struct tty_struct *tty); extern void tty_shutdown(struct tty_struct *tty); extern void tty_free_termios(struct tty_struct *tty); extern int is_current_pgrp_orphaned(void); @@ -470,7 +473,9 @@ extern void proc_clear_tty(struct task_struct *p); extern struct tty_struct *get_current_tty(void); extern void tty_default_fops(struct file_operations *fops); extern struct tty_struct *alloc_tty_struct(void); -extern int tty_add_file(struct tty_struct *tty, struct file *file); +extern int tty_alloc_file(struct file *file); +extern void tty_add_file(struct tty_struct *tty, struct file *file); +extern void tty_free_file(struct file *file); extern void free_tty_struct(struct tty_struct *tty); extern void initialize_tty_struct(struct tty_struct *tty, struct tty_driver *driver, int idx); @@ -578,6 +583,8 @@ extern int __init tty_init(void); /* tty_ioctl.c */ extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); +extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg); /* serial.c */ @@ -599,8 +606,24 @@ extern long vt_compat_ioctl(struct tty_struct *tty, /* functions for preparation of BKL removal */ extern void __lockfunc tty_lock(void) __acquires(tty_lock); extern void __lockfunc tty_unlock(void) __releases(tty_lock); -extern struct task_struct *__big_tty_mutex_owner; -#define tty_locked() (current == __big_tty_mutex_owner) + +/* + * this shall be called only from where BTM is held (like close) + * + * We need this to ensure nobody waits for us to finish while we are waiting. + * Without this we were encountering system stalls. + * + * This should be indeed removed with BTM removal later. + * + * Locking: BTM required. Nobody is allowed to hold port->mutex. + */ +static inline void tty_wait_until_sent_from_close(struct tty_struct *tty, + long timeout) +{ + tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */ + tty_wait_until_sent(tty, timeout); + tty_lock(); +} /* * wait_event_interruptible_tty -- wait for a condition with the tty lock held |