From: Johan Hovold <jhovold@gmail.com>
Date: Mon, 26 May 2014 17:23:43 +0000 (+0200)
Subject: USB: cdc-acm: fix failed open not being detected
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8727bf689a77a79816065e23a7a58a474ad544f9;p=openwrt%2Fstaging%2Fblogic.git

USB: cdc-acm: fix failed open not being detected

Fix errors during open not being returned to userspace. Specifically,
failed control-line manipulations or control or read urb submissions
would not be detected.

Fixes: 7fb57a019f94 ("USB: cdc-acm: Fix potential deadlock (lockdep
warning)")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 74df311c8505..6c6928a154bd 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -525,17 +525,17 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 	acm->control->needs_remote_wakeup = 1;
 
 	acm->ctrlurb->dev = acm->dev;
-	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
+	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
+	if (retval) {
 		dev_err(&acm->control->dev,
 			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 		goto error_submit_urb;
 	}
 
 	acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
-	if (acm_set_control(acm, acm->ctrlout) < 0 &&
-	    (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
+	retval = acm_set_control(acm, acm->ctrlout);
+	if (retval < 0 && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 		goto error_set_control;
-	}
 
 	/*
 	 * Unthrottle device in case the TTY was closed while throttled.
@@ -545,7 +545,8 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 	acm->throttle_req = 0;
 	spin_unlock_irq(&acm->read_lock);
 
-	if (acm_submit_read_urbs(acm, GFP_KERNEL))
+	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
+	if (retval)
 		goto error_submit_read_urbs;
 
 	usb_autopm_put_interface(acm->control);
@@ -564,7 +565,8 @@ error_submit_urb:
 error_get_interface:
 disconnected:
 	mutex_unlock(&acm->mutex);
-	return retval;
+
+	return usb_translate_errors(retval);
 }
 
 static void acm_port_destruct(struct tty_port *port)