linux-kernel - Re: BUG in: Driver core: convert block from raw kobjects to core devices

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Message-ID: <20071018192741.GA18786@kroah.com>
Date:	Thu, 18 Oct 2007 12:27:41 -0700
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: BUG in: Driver core: convert block from raw kobjects to core
	devices

On Thu, Oct 18, 2007 at 03:23:49PM -0400, Alan Stern wrote:
> This patch (as1004) fixes a refcounting bug in the development version
> of the block-device core.
> 
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>
> 
> ---
> 
> Kay, you have got to start testing your patches better!  Finding and
> fixing refcount errors is _not_ one of my favorite ways to pass the
> time.  For example, you could see what happens when you insert and
> unplug a USB flash disk a few times.
> 
> Greg, you'll probably want to just fold this in with Kay's 
> block-device.patch.
> 
> Alan Stern
> 
> 
> Index: usb-2.6/fs/partitions/check.c
> ===================================================================
> --- usb-2.6.orig/fs/partitions/check.c
> +++ usb-2.6/fs/partitions/check.c
> @@ -516,5 +516,4 @@ void del_gendisk(struct gendisk *disk)
>  	sysfs_remove_link(&block_depr, disk->dev.bus_id);
>  #endif
>  	device_del(&disk->dev);
> -	put_device(&disk->dev);
>  }

Are we sure this is correct?  Kay and I spent a lot of time (well, Kay
did all the work) a few weeks ago trying to track down a bug in this
area, and this was the solution from what I remember.

Kay, thoughts?

thanks,

greg k-h
-
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