Revert "NET: Fix locking issues in PPP, 6pack, mkiss and strip line disciplines."

This reverts commit adeab1afb7de89555c69aab5ca21300c14af6369.

As Alan Cox explained, the TTY layer changes that went recently
to get rid of the tty->low_latency stuff fixes this already,
and even for -stable it's the ->low_latency changes that should
go in to fix this, rather than this patch.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/net/ppp_synctty.c b/drivers/net/ppp_synctty.c
index 1b3f75febee1..aa3d39f38e22 100644
--- a/drivers/net/ppp_synctty.c
+++ b/drivers/net/ppp_synctty.c
@@ -182,15 +182,13 @@ static DEFINE_RWLOCK(disc_data_lock);
 
 static struct syncppp *sp_get(struct tty_struct *tty)
 {
-	unsigned long flags;
 	struct syncppp *ap;
 
-	read_lock_irqsave(&disc_data_lock, flags);
+	read_lock(&disc_data_lock);
 	ap = tty->disc_data;
 	if (ap != NULL)
 		atomic_inc(&ap->refcnt);
-	read_unlock_irqrestore(&disc_data_lock, flags);
-
+	read_unlock(&disc_data_lock);
 	return ap;
 }
 
@@ -264,13 +262,12 @@ ppp_sync_open(struct tty_struct *tty)
 static void
 ppp_sync_close(struct tty_struct *tty)
 {
-	unsigned long flags;
 	struct syncppp *ap;
 
-	write_lock_irqsave(&disc_data_lock, flags);
+	write_lock_irq(&disc_data_lock);
 	ap = tty->disc_data;
 	tty->disc_data = NULL;
-	write_unlock_irqrestore(&disc_data_lock, flags);
+	write_unlock_irq(&disc_data_lock);
 	if (!ap)
 		return;