From bc30c3b23bb953fc6eb59e7ac6ecb48d92962bb0 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Wed, 6 Mar 2013 07:20:55 -0500 Subject: [PATCH] tty: Use spin_lock() inside existing critical region The interrupt state does not need to be saved, disabled and restored here; interrupts are already off because this lock is bracketed by spin_lock_irq/spin_unlock_irq. Signed-off-by: Peter Hurley Acked-by: Jiri Slaby Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index fb50442..2661e86 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -545,7 +545,6 @@ EXPORT_SYMBOL_GPL(tty_wakeup); static int tty_signal_session_leader(struct tty_struct *tty) { struct task_struct *p; - unsigned long flags; int refs = 0; read_lock(&tasklist_lock); @@ -565,10 +564,10 @@ static int tty_signal_session_leader(struct tty_struct *tty) __group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p); __group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p); put_pid(p->signal->tty_old_pgrp); /* A noop */ - spin_lock_irqsave(&tty->ctrl_lock, flags); + spin_lock(&tty->ctrl_lock); if (tty->pgrp) p->signal->tty_old_pgrp = get_pid(tty->pgrp); - spin_unlock_irqrestore(&tty->ctrl_lock, flags); + spin_unlock(&tty->ctrl_lock); spin_unlock_irq(&p->sighand->siglock); } while_each_pid_task(tty->session, PIDTYPE_SID, p); } -- 2.7.4