linux-kernel - [PATCH 8/9] USB: serial: clear fifo on close

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Date:	Wed, 17 Mar 2010 23:00:44 +0100
From:	Johan Hovold <jhovold@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Johan Hovold <jhovold@...il.com>
Subject: [PATCH 8/9] USB: serial: clear fifo on close

Make sure fifo is emptied on close.

Signed-off-by: Johan Hovold <jhovold@...il.com>
---
 drivers/usb/serial/generic.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index d3ef69f..e0c7d53 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -155,13 +155,19 @@ EXPORT_SYMBOL_GPL(usb_serial_generic_open);
 static void generic_cleanup(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;
+	unsigned long flags;
 
 	dbg("%s - port %d", __func__, port->number);
 
 	if (serial->dev) {
 		/* shutdown any bulk transfers that might be going on */
-		if (port->bulk_out_size)
+		if (port->bulk_out_size) {
 			usb_kill_urb(port->write_urb);
+
+			spin_lock_irqsave(&port->lock, flags);
+			kfifo_reset_out(&port->write_fifo);
+			spin_unlock_irqrestore(&port->lock, flags);
+		}
 		if (port->bulk_in_size)
 			usb_kill_urb(port->read_urb);
 	}
-- 
1.7.0.2

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