linux-kernel - [PATCH 4/6] vt: waitevent is self locked so drop the tty

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Date:	Fri, 02 Mar 2012 14:59:49 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH 4/6] vt: waitevent is self locked so drop the tty_lock

From: Alan Cox <alan@...ux.intel.com>

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 drivers/tty/vt/vt_ioctl.c |   11 ++---------
 1 files changed, 2 insertions(+), 9 deletions(-)


diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index c6720be..ede2ef1 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -130,7 +130,7 @@ static void vt_event_wait(struct vt_event_wait *vw)
 	list_add(&vw->list, &vt_events);
 	spin_unlock_irqrestore(&vt_event_lock, flags);
 	/* Wait for it to pass */
-	wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
+	wait_event_interruptible(vt_event_waitqueue, vw->done);
 	/* Dequeue it */
 	spin_lock_irqsave(&vt_event_lock, flags);
 	list_del(&vw->list);
@@ -671,11 +671,8 @@ int vt_ioctl(struct tty_struct *tty,
 			return -EPERM;
 		if (arg == 0 || arg > MAX_NR_CONSOLES)
 			ret = -ENXIO;
-		else {
-			tty_lock();
+		else
 			ret = vt_waitactive(arg);
-			tty_unlock();
-		}
 		break;
 
 	/*
@@ -1426,14 +1423,10 @@ int vt_move_to_console(unsigned int vt, int alloc)
 		return -EIO;
 	}
 	console_unlock();
-	/* Review: I don't see why we need tty_lock here FIXME */
-	tty_lock();
 	if (vt_waitactive(vt + 1)) {
 		pr_debug("Suspend: Can't switch VCs.");
-		tty_unlock();
 		return -EINTR;
 	}
-	tty_unlock();
 	return prev;
 }
 

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