linux-kernel - Re: [patch] usb-skeleton leaking locks on open.

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Message-ID: <20070924162652.GA5227@linux.intel.com>
Date:	Mon, 24 Sep 2007 09:26:52 -0700
From:	Mark Gross <mgross@...ux.intel.com>
To:	lkml <linux-kernel@...r.kernel.org>,
	usbdev <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [patch] usb-skeleton leaking locks on open.

forgot to CC greg ...


On Mon, Sep 24, 2007 at 09:18:22AM -0700, Mark Gross wrote:
> This weekend I was hacking around with a trivial USB driver for talking
> to the boot load firmware of a USB Bit Whacker.  It's running the
> MicroChip Pic18 boot loader firmware and I'm putting together a flash
> program for writing new FW to the thing.
> 
> Anyway in my use of the usb-skeleton.c as my starting point I discovered
> my test program was getting hung up after attempting to write a buffer.
> The application and driver where hung in a way that required me to
> reboot to get it to clean up so I could try again.
> 
> It turned out the code path through skel_open can grap the driver's
> io_mutex lock and forget to release it.
> 
> The following patch fixes the problem for me.
> 
> --mgross
> 
> Signed-off-by: Mark Gross <mgross@...ux.intel.com>
> 
> diff -urN -X linux-2.6.23-rc7/Documentation/dontdiff linux-2.6.23-rc7/drivers/usb/usb-skeleton.c linux-2.6.23-rc7-bugfix/drivers/usb/usb-skeleton.c
> --- linux-2.6.23-rc7/drivers/usb/usb-skeleton.c	2007-09-24 08:57:54.000000000 -0700
> +++ linux-2.6.23-rc7-bugfix/drivers/usb/usb-skeleton.c	2007-09-24 09:01:43.000000000 -0700
> @@ -125,6 +125,7 @@
>  
>  	/* save our object in the file's private structure */
>  	file->private_data = dev;
> +	mutex_unlock(&dev->io_mutex);
>  
>  exit:
>  	return retval;
> -
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