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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 <peter@hurleysoftware.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-10-16 15:33:25 -04:00 committed by Greg Kroah-Hartman
parent 4d8c1dff6a
commit 6054c16e80
2 changed files with 6 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/tty/n_tty.c
View File

@ -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--;

10
drivers/tty/pty.c
View File

@ -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);
}
}