linux-kernel - Re: [PATCH] fix usb skeleton driver

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Date:	Wed, 6 Jun 2012 09:32:15 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	stefani@...bold.net
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH] fix usb skeleton driver

Am Mittwoch, 6. Juni 2012, 09:00:36 schrieb stefani@...bold.net:
> @@ -126,32 +122,21 @@ exit:
>  
>  static int skel_release(struct inode *inode, struct file *file)
>  {
> -       struct usb_skel *dev;
> -
> -       dev = file->private_data;
> -       if (dev == NULL)
> -               return -ENODEV;
> +       struct usb_skel *dev = file->private_data;
>  
>         /* allow the device to be autosuspended */
> -       mutex_lock(&dev->io_mutex);
> -       if (dev->interface)
> -               usb_autopm_put_interface(dev->interface);
> -       mutex_unlock(&dev->io_mutex);
> +       usb_autopm_put_interface(dev->interface);

That is a bug. You must check for disconnect here, because
after a disconnect the interface may be bound already to another
driver.

	Regards
		Oliver
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