linux-kernel - usb_serial_suspend(): buggy(?) code

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Message-ID: <20070723015128.GY26212@stusta.de>
Date:	Mon, 23 Jul 2007 03:51:28 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Oliver Neukum <oneukum@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: usb_serial_suspend(): buggy(?) code

Commit ec22559e0b7a05283a3413bda5d177e42c950e23 added the following 
function to drivers/usb/serial/usb-serial.c:

<--  snip  -->

...
int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
{
        struct usb_serial *serial = usb_get_intfdata(intf);
        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->type->suspend)
                serial->type->suspend(serial, message);

        return r;
}
...

<--  snip  -->

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.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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