diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2007-05-08 00:26:53 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:04 -0700 |
commit | 2a65f1d9fe78475720bd8f0e0fbbf1973b1b5ac2 (patch) | |
tree | f23bfe8a3602d1fea448d3416c639957bccc9677 | |
parent | f67c3627b4abd8a3cf56bd20cafde702feffe236 (diff) | |
download | linux-2a65f1d9fe78475720bd8f0e0fbbf1973b1b5ac2.tar.bz2 |
tty: simplify calling of put_pid.
This patch should contain no functional changes.
At some point I got confused and thought put_pid could not be called while a
spin lock was held. While it may be nice to avoid that to reduce lock hold
times put_pid can be safely called while we hold a spin lock.
This patch removes all of the complications from the code introduced by my
misunderstanding, making the code a little more readable.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | drivers/char/tty_io.c | 23 |
1 files changed, 6 insertions, 17 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index a7b915516d7b..39db186d5c5b 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -153,8 +153,7 @@ int tty_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg); static int tty_fasync(int fd, struct file * filp, int on); static void release_tty(struct tty_struct *tty, int idx); -static struct pid *__proc_set_tty(struct task_struct *tsk, - struct tty_struct *tty); +static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty); /** * alloc_tty_struct - allocate a tty object @@ -1532,10 +1531,9 @@ void disassociate_ctty(int on_exit) } spin_lock_irq(¤t->sighand->siglock); - tty_pgrp = current->signal->tty_old_pgrp; + put_pid(current->signal->tty_old_pgrp); current->signal->tty_old_pgrp = NULL; spin_unlock_irq(¤t->sighand->siglock); - put_pid(tty_pgrp); mutex_lock(&tty_mutex); /* It is possible that do_tty_hangup has free'd this tty */ @@ -2506,7 +2504,6 @@ static int tty_open(struct inode * inode, struct file * filp) int index; dev_t device = inode->i_rdev; unsigned short saved_flags = filp->f_flags; - struct pid *old_pgrp; nonseekable_open(inode, filp); @@ -2600,17 +2597,15 @@ got_driver: goto retry_open; } - old_pgrp = NULL; mutex_lock(&tty_mutex); spin_lock_irq(¤t->sighand->siglock); if (!noctty && current->signal->leader && !current->signal->tty && tty->session == NULL) - old_pgrp = __proc_set_tty(current, tty); + __proc_set_tty(current, tty); spin_unlock_irq(¤t->sighand->siglock); mutex_unlock(&tty_mutex); - put_pid(old_pgrp); return 0; } @@ -3835,9 +3830,8 @@ void proc_clear_tty(struct task_struct *p) spin_unlock_irq(&p->sighand->siglock); } -static struct pid *__proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) +static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) { - struct pid *old_pgrp; if (tty) { /* We should not have a session or pgrp to here but.... */ put_pid(tty->session); @@ -3845,21 +3839,16 @@ static struct pid *__proc_set_tty(struct task_struct *tsk, struct tty_struct *tt tty->session = get_pid(task_session(tsk)); tty->pgrp = get_pid(task_pgrp(tsk)); } - old_pgrp = tsk->signal->tty_old_pgrp; + put_pid(tsk->signal->tty_old_pgrp); tsk->signal->tty = tty; tsk->signal->tty_old_pgrp = NULL; - return old_pgrp; } void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) { - struct pid *old_pgrp; - spin_lock_irq(&tsk->sighand->siglock); - old_pgrp = __proc_set_tty(tsk, tty); + __proc_set_tty(tsk, tty); spin_unlock_irq(&tsk->sighand->siglock); - - put_pid(old_pgrp); } struct tty_struct *get_current_tty(void) |