Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760585AbYJ3Vvx (ORCPT ); Thu, 30 Oct 2008 17:51:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759470AbYJ3Vvn (ORCPT ); Thu, 30 Oct 2008 17:51:43 -0400 Received: from qb-out-0506.google.com ([72.14.204.226]:53692 "EHLO qb-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759495AbYJ3Vvn (ORCPT ); Thu, 30 Oct 2008 17:51:43 -0400 Message-ID: Date: Thu, 30 Oct 2008 22:51:41 +0100 From: "Kay Sievers" To: "Peter Korsgaard" Subject: Re: 2.6.28-rc2: (mtd)block/partitions BUG with kobject reference count Cc: "Rafael J. Wysocki" , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org In-Reply-To: <87abcnj810.fsf@macbook.be.48ers.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <87ej1z4ep8.fsf@macbook.be.48ers.dk> <200810300027.19116.rjw@sisk.pl> <87abcnj810.fsf@macbook.be.48ers.dk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1543 Lines: 35 On Thu, Oct 30, 2008 at 00:28, Peter Korsgaard wrote: >>>>>> "Rafael" == Rafael J Wysocki writes: > > Rafael> On Wednesday, 29 of October 2008, Peter Korsgaard wrote: > >> Hi, > >> > >> I'm seing what looks like a kobject reference count issue with > >> mtdblock_ro + mtd_dataflash + mtd partitions and repeated unbind/bind. > >> I'm on 2.6.28-rc2, but I can reproduce the problem on 2.6.27 as well. > > Rafael> Is it reproducible with 2.6.26 too? > > Sorry, I haven't backported my platform support code to such "old" > kernel. I can do it though, if you think it will help pinpoint the > issue. This sounds like a possible reason for the problem: "After digging into the mtd code, this bug is not related to our driver. It should be a subtle bug in mtd core code. In add_mtd_partition, for 2 partitions, 2 gendisk structures will be allocated. But these 2 gendisk->queue will be set to the same request_queue. Then when unregistering the 1st partition, from the same request_queue->backing_dev_info, the bdi struct will be set to NULL. So for the 2nd partition (bdi == NULL), the sysfs dir of 2nd partition will not be removed. Finally, when modprobe the module again, the 2nd partition won't be added" https://blackfin.uclinux.org/gf/tracker/4463 Kay -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/