linux-kernel - Re: Oops in usb-serial with keyspan adapter on current upstream

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Date:	Mon, 25 May 2009 11:17:36 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: Oops in usb-serial with keyspan adapter on current upstream

On Mon, 25 May 2009, Benjamin Herrenschmidt wrote:

> Found it. Patch below.
> 
> usb-serial: Fix crash when sub-driver attach() returns positive value
> 
> This fixes a crash in usb-serial that typically happens with keyspan USB
> devices, though it would happen potentially with anything that returns
> a positive value from the subdriver's attach() method to indicate that
> a FW was loaded and the device will disconnect and reconnect.
> 
> What happens is that we haven't yet initialized the struct device embedded
> inside the struct usb_serial_port when we call "exit:" and return
> from probe().
> 
> Later, when we get the disconnect() call, usb_serial_disconnect() tries
> to do a device_del() and put_device() on all the ports, despite the fact
> that in this case, the struct device wasn't initialized. This causes the
> device core to crash (right, it should be more robust).

Very clever.  Does this simpler patch also fix the problem?

Alan Stern


Index: usb-2.6/drivers/usb/serial/usb-serial.c
===================================================================
--- usb-2.6.orig/drivers/usb/serial/usb-serial.c
+++ usb-2.6/drivers/usb/serial/usb-serial.c
@@ -974,6 +974,7 @@ int usb_serial_probe(struct usb_interfac
 		if (retval > 0) {
 			/* quietly accept this device, but don't bind to a
 			   serial port as it's about to disappear */
+			serial->num_ports = 0;
 			goto exit;
 		}
 	}

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