From 3827d8762febd68ff1b6db0bb5efa55bfbccaeb4 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@gmail.com>
Date: Thu, 10 Nov 2011 17:38:13 +0100
Subject: [PATCH] USB: serial: do not forward USB specific errors in open

Use usb_translate_errors() to map USB-specific errors to errors
appropriate for user space (ENOMEM, ENODEV and EIO) in open.

Currently almost all serial drivers simply forward error codes from the
stack (e.g. from usb_submit_urb()), but these codes often have
different meanings in user-space. Doing the mapping in usb-serial core
simplifies driver code and allows for more consistent error reporting.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/usb/serial/usb-serial.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 8d5190f3d8eba..a2a0574b662a3 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -260,6 +260,10 @@ static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
 	else
 		retval = port->serial->type->open(tty, port);
 	mutex_unlock(&serial->disc_mutex);
+
+	if (retval < 0)
+		retval = usb_translate_errors(retval);
+
 	return retval;
 }
 
-- 
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