netdev - [PATCH 5/6] hso: Fix for 5 sec timeouts with v2.x firmware

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Date:	Tue, 5 Jan 2010 15:52:42 +0100
From:	Jan Dumon <j.dumon@...ion.com>
To:	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 5/6] hso: Fix for 5 sec timeouts with v2.x firmware

From: Jan Dumon <j.dumon@...ion.com>

Don't send flow control settings to any port other than the modem port.
Older firmware ignored this request but did sent a reply. Newer firmware just
ignores it without reply and causes a 5 second timeout every time a port
(except for the modem port) is opened or if tiocm settings are changed.

Signed-off-by: Jan Dumon <j.dumon@...ion.com>

--- linux-2.6.orig/drivers/net/usb/hso.c
+++ linux-2.6/drivers/net/usb/hso.c
@@ -1723,6 +1723,10 @@ static int hso_serial_tiocmset(struct tt
 		D1("no tty structures");
 		return -EINVAL;
 	}
+
+	if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
+		return -EINVAL;
+
 	if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
 
 	spin_lock_irqsave(&serial->serial_lock, flags);
--
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