linux-kernel - [PATCH] tty: keyboard.c: Remove locking from vt_get

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Message-Id: <1340370994-6914-1-git-send-email-chris@the-brannons.com>
Date:	Fri, 22 Jun 2012 08:16:34 -0500
From:	Christopher Brannon <chris@...-brannons.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] tty: keyboard.c: Remove locking from vt_get_leds.

There are three call sites for this function, and all three
are called within a keyboard handler.
kbd_event_lock is already held within keyboard handlers,
so attempting to lock it in vt_get_leds causes deadlock.

Signed-off-by: Christopher Brannon <chris@...-brannons.com>
---
 drivers/tty/vt/keyboard.c |    3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 48cc6f2..770a854 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -1049,13 +1049,10 @@ static int kbd_update_leds_helper(struct input_handle *handle, void *data)
  */
 int vt_get_leds(int console, int flag)
 {
-	unsigned long flags;
 	struct kbd_struct * kbd = kbd_table + console;
 	int ret;

-	spin_lock_irqsave(&kbd_event_lock, flags);
 	ret = vc_kbd_led(kbd, flag);
-	spin_unlock_irqrestore(&kbd_event_lock, flags);

 	return ret;
 }
-- 
1.7.10.4

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