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tty: Export redirect release

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This will be required by the pty code when it removes tty_vhangup() on
master close.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Link: https://lore.kernel.org/r/20201124004902.1398477-2-minyard@acm.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Corey Minyard 2020-11-23 18:49:01 -06:00 committed by Greg Kroah-Hartman
parent c31c3ea02e
commit f446776ebf
2 changed files with 25 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

32
drivers/tty/tty_io.c
View file

@ -540,6 +540,28 @@ void tty_wakeup(struct tty_struct *tty)
EXPORT_SYMBOL_GPL(tty_wakeup); EXPORT_SYMBOL_GPL(tty_wakeup);
/**
* tty_release_redirect - Release a redirect on a pty if present
* @tty: tty device
*
* This is available to the pty code so if the master closes, if the
* slave is a redirect it can release the redirect.
*/
struct file *tty_release_redirect(struct tty_struct *tty)
{
struct file *f = NULL;
spin_lock(&redirect_lock);
if (redirect && file_tty(redirect) == tty) {
f = redirect;
redirect = NULL;
}
spin_unlock(&redirect_lock);
return f;
}
EXPORT_SYMBOL_GPL(tty_release_redirect);
/** /**
* __tty_hangup - actual handler for hangup events * __tty_hangup - actual handler for hangup events
* @tty: tty device * @tty: tty device
@ -566,7 +588,7 @@ EXPORT_SYMBOL_GPL(tty_wakeup);
static void __tty_hangup(struct tty_struct *tty, int exit_session) static void __tty_hangup(struct tty_struct *tty, int exit_session)
{ {
struct file *cons_filp = NULL; struct file *cons_filp = NULL;
struct file *filp, *f = NULL; struct file *filp, *f;
struct tty_file_private *priv; struct tty_file_private *priv;
int closecount = 0, n; int closecount = 0, n;
int refs; int refs;
@ -574,13 +596,7 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
if (!tty) if (!tty)
return; return;
f = tty_release_redirect(tty);
spin_lock(&redirect_lock);
if (redirect && file_tty(redirect) == tty) {
f = redirect;
redirect = NULL;
}
spin_unlock(&redirect_lock);
tty_lock(tty); tty_lock(tty);

1
include/linux/tty.h
View file

@ -421,6 +421,7 @@ extern void tty_kclose(struct tty_struct *tty);
extern int tty_dev_name_to_number(const char *name, dev_t *number); extern int tty_dev_name_to_number(const char *name, dev_t *number);
extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout); extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
extern void tty_ldisc_unlock(struct tty_struct *tty); extern void tty_ldisc_unlock(struct tty_struct *tty);
extern struct file *tty_release_redirect(struct tty_struct *tty);
#else #else
static inline void tty_kref_put(struct tty_struct *tty) static inline void tty_kref_put(struct tty_struct *tty)
{ } { }