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[PATCH] do_acct_process(): don't take tty_mutex

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No need to take the global tty_mutex, signal->tty->driver can't go away while
we are holding ->siglock.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-12-08 02:36:07 -08:00 committed by Linus Torvalds
parent 9159350412
commit 7bcfa95e56
1 changed files with 2 additions and 5 deletions
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7
kernel/acct.c
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@ -485,12 +485,9 @@ static void do_acct_process(struct file *file)
ac.ac_ppid = current->parent->tgid;
#endif
mutex_lock(&tty_mutex);
tty = get_current_tty();
ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
mutex_unlock(&tty_mutex);
spin_lock_irq(&current->sighand->siglock);
tty = current->signal->tty;
ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));
ac.ac_flag = pacct->ac_flag;