From e142a31da34b42458e10026b554e66127739cf23 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 1 Jun 2010 22:53:10 +0200
Subject: tty: release BTM while sleeping in block_til_ready

Most tty drivers may block while opening a device.
Since this possibly depends on another thread
closing it first and both threads may need the BTM,
we need to release it here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/char/tty_port.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/char/tty_port.c')

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 35eb30402f18..33d37d230f8f 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -294,7 +294,9 @@ int tty_port_block_til_ready(struct tty_port *port,
 			retval = -ERESTARTSYS;
 			break;
 		}
+		tty_unlock();
 		schedule();
+		tty_lock();
 	}
 	finish_wait(&port->open_wait, &wait);
 
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