From: Oliver Neukum <oneukum@suse.de>
Date: Mon, 23 Jul 2007 06:58:39 +0000 (+0200)
Subject: USB: fix usb_serial_suspend(): buggy code
X-Git-Tag: v2.6.23-rc2~151^2~11
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e31c18804f584dd838a752f6628e8c15bd7a3372;p=linux-2.6

USB: fix usb_serial_suspend(): buggy code

Am Montag 23 Juli 2007 schrieb Adrian Bunk:
> Commit ec22559e0b7a05283a3413bda5d177e42c950e23 added the following
> function to drivers/usb/serial/usb-serial.c:
>
[..]
>
> The Coverity checker spotted the inconsequent NULL checking for "serial".
>
> Looking at the code it also doesn't seem to have been intended to always
> return 0.

Coverity is right. The check for NULL is wrongly done and the error
return is lost.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index a3665659d1..5e1cf78c77 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1077,16 +1077,17 @@ int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
 	struct usb_serial_port *port;
 	int i, r = 0;
 
-	if (serial) {
-		for (i = 0; i < serial->num_ports; ++i) {
-			port = serial->port[i];
-			if (port)
-				kill_traffic(port);
-		}
+	if (!serial) /* device has been disconnected */
+		return 0;
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+		if (port)
+			kill_traffic(port);
 	}
 
 	if (serial->type->suspend)
-		serial->type->suspend(serial, message);
+		r = serial->type->suspend(serial, message);
 
 	return r;
 }