linux-kernel - Re: [PATCH] usb-serial regression (Oops) in 2.6.21-rc*

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Date:	Mon, 12 Mar 2007 13:33:31 -0700
From:	Greg KH <greg@...ah.com>
To:	Mark Lord <lkml@....ca>, Jim Radford <radford@...ckbean.org>,
	linux-usb-devel@...ts.sourceforge.net
Cc:	Oliver Neukum <oneukum@...e.de>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb-serial regression (Oops)  in 2.6.21-rc*

On Mon, Mar 12, 2007 at 04:22:22PM -0400, Mark Lord wrote:
> Oliver Neukum wrote:
> >>Mark Lord wrote:
> >>>Okay, from that part (above), the problem is obvious:
> >>>in that the "MCT U232 converter now disconnected" appears,
> >>>and then we continue to try and call the driver's method.. Oops!
> ..
> >IMHO shutdown() is using serial->port[] and bombs.
> >Could you reverse the order here?
> 
> Yup.  Fixed.  Tested.  Works.
> 
> This patch fixes the Oops that otherwise occurs whenever
> a USB serial adapter is unplugged from a system, as well
> the Oops seen when one is in use before resume (to RAM).
> 
> GregKH:  This needs to go into 2.6.21-rc*.
> 
> Signed-off-by:  Mark Lord <mlord@...ox.com>
> ---
> --- 2.6.21-rc3/drivers/usb/serial/usb-serial.c	2007-03-12 
> 11:22:43.000000000 -0400
> +++ linux/drivers/usb/serial/usb-serial.c	2007-03-12 
> 16:12:53.000000000 -0400
> @@ -141,6 +141,9 @@
> 	for (i = 0; i < serial->num_ports; ++i)
> 		serial->port[i]->open_count = 0;
> 
> +	if (serial->type->shutdown)
> +		serial->type->shutdown(serial);
> +
> 	/* the ports are cleaned up and released in port_release() */
> 	for (i = 0; i < serial->num_ports; ++i)
> 		if (serial->port[i]->dev.parent != NULL) {
> @@ -148,9 +151,6 @@
> 			serial->port[i] = NULL;
> 		}
> 
> -	if (serial->type->shutdown)
> -		serial->type->shutdown(serial);
> -


Argh, no, this change was done to help the ftdi drivers out.

Look at changeset d9a7ecacac5f8274d2afce09aadcf37bdb42b93a in Linus's
tree from Jim Radford:
	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d9a7ecacac5f8274d2afce09aadcf37bdb42b93a

It makes this change because the usb-serial drivers need the port
devices when the port_remove() callbacks happen.  Otherwise you get an
oops that way.

Jim, can you take a look at this and see if you can figure something
out?

thanks,

greg k-h
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