From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH] kobject: provide kobject_put_wait to fix module unload race Date: Sat, 4 Jan 2014 19:48:23 -0800 Message-ID: <20140105034823.GE22595@kroah.com> References: <52C84F76.6010505@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <52C84F76.6010505@suse.com> Sender: linux-kernel-owner@vger.kernel.org To: Jeff Mahoney Cc: Mikulas Patocka , torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com, tglx@linutronix.de, paulmck@linux.vnet.ibm.com, mingo@kernel.org List-Id: dm-devel.ids On Sat, Jan 04, 2014 at 01:14:14PM -0500, Jeff Mahoney wrote: > On 1/4/14, 1:06 PM, Mikulas Patocka wrote: > > Hi > > > > I noticed that Jeff Mahoney added a new structure kobj_completion, defined > > in include/linux/kobj_completion.h to the kernel 3.13-rc1 in the patch > > eee031649707db3c9920d9498f8d03819b74fc23. In the current upstream kernel, > > this interface is still unused. > > > > However, converting the drivers to use kobj_completion is not trivial > > (note that all users of the original kobject interface are buggy - so all > > of them need to be converted). > > > > I came up with a simpler patch to achieve the same purpose - this patch > > makes fixing the drivers easy - the driver is fixed just by replacing > > "kobject_put" with "kobject_put_wait" in the unload routine. > > > > I'd like to ask if you could revert > > eee031649707db3c9920d9498f8d03819b74fc23 (no code uses it) and replace it > > with this patch. > > I have no objections to reverting it. There were concerns from Al Viro > that it'd be tough to get right by callers and I had assumed it got > dropped after that. I had planned on using it in my btrfs sysfs exports > patchset but came up with a better way. Ok, thanks, I'll revert it for 3.14. greg k-h