From 6054c16e80318d32ee084a0f5620a863ae8cea33 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Thu, 16 Oct 2014 15:33:25 -0400 Subject: [PATCH] tty: Use spin_lock_irq() for ctrl_lock when interrupts enabled Interrupts are enabled in the n_tty_read() loop, ioctl(TIOCPKT) and pty driver flush_buffer() routine; no need to save and restore local interrupt state. Signed-off-by: Peter Hurley Reviewed-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_tty.c | 5 ++--- drivers/tty/pty.c | 10 ++++------ 2 files changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 89c4cee253e3..d521058ee55a 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -2128,7 +2128,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, int minimum, time; ssize_t retval = 0; long timeout; - unsigned long flags; int packet; c = job_control(tty, file); @@ -2174,10 +2173,10 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, unsigned char cs; if (b != buf) break; - spin_lock_irqsave(&tty->link->ctrl_lock, flags); + spin_lock_irq(&tty->link->ctrl_lock); cs = tty->link->ctrl_status; tty->link->ctrl_status = 0; - spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); + spin_unlock_irq(&tty->link->ctrl_lock); if (tty_put_user(tty, cs, b++)) { retval = -EFAULT; b--; diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 394374789292..29b5eeb01856 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -178,13 +178,12 @@ static int pty_get_lock(struct tty_struct *tty, int __user *arg) /* Set the packet mode on a pty */ static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) { - unsigned long flags; int pktmode; if (get_user(pktmode, arg)) return -EFAULT; - spin_lock_irqsave(&tty->ctrl_lock, flags); + spin_lock_irq(&tty->ctrl_lock); if (pktmode) { if (!tty->packet) { tty->packet = 1; @@ -192,7 +191,7 @@ static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) } } else tty->packet = 0; - spin_unlock_irqrestore(&tty->ctrl_lock, flags); + spin_unlock_irq(&tty->ctrl_lock); return 0; } @@ -221,16 +220,15 @@ static int pty_signal(struct tty_struct *tty, int sig) static void pty_flush_buffer(struct tty_struct *tty) { struct tty_struct *to = tty->link; - unsigned long flags; if (!to) return; /* tty_buffer_flush(to); FIXME */ if (to->packet) { - spin_lock_irqsave(&tty->ctrl_lock, flags); + spin_lock_irq(&tty->ctrl_lock); tty->ctrl_status |= TIOCPKT_FLUSHWRITE; wake_up_interruptible(&to->read_wait); - spin_unlock_irqrestore(&tty->ctrl_lock, flags); + spin_unlock_irq(&tty->ctrl_lock); } } -- 2.20.1