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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 <peter@hurleysoftware.com>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Peter Hurley 2013-03-06 07:20:55 -05:00 committed by Greg Kroah-Hartman
parent 20cc225bab
commit bc30c3b23b
1 changed files with 2 additions and 3 deletions
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5
drivers/tty/tty_io.c
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@ -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);
}