[PATCH 1/3] usb console: fix mutex lock regression

[Jason Wessel <jason.wessel@windriver.com>]

During the 2.6.32 development the use of serial->disc_mutex was
introduced.  In usb_console_setup() the call to
usb_serial_get_by_index() will obtain this mutex. The
usb_console_setup() must release the mutex before it completes else
later calls to the usb serial core will hang.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Greg KH <gregkh@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>

---
 drivers/usb/serial/console.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index be086e4..166ba4e 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -176,6 +176,7 @@ static int usb_console_setup(struct console *co, char *options)
 	 * indicate this port is now acting as a system console. */
 	port->console = 1;
 	retval = 0;
+	mutex_unlock(&serial->disc_mutex);
 
 out:
 	return retval;
-- 
1.6.4.rc1