[dm-devel] [PATCH] kobject: provide kobject_put_wait to fix module unload race
Greg Kroah-Hartman
gregkh at linuxfoundation.org
Sun Jan 5 03:48:23 UTC 2014
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
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