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Date: Sat, 1 Nov 2014 17:18:10 -0600
From: Jens Axboe <axboe@fb.com>
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To: Ben Hutchings <ben@decadent.org.uk>,
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CC: <akpm@linux-foundation.org>, Keith Busch <keith.busch@intel.com>
Subject: Re: [PATCH 3.2 023/102] block: Fix dev_t minor allocation lifetime
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On 2014-11-01 16:28, Ben Hutchings wrote:
> 3.2.64-rc1 review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Keith Busch <keith.busch@intel.com>
>
> commit 2da78092dda13f1efd26edbbf99a567776913750 upstream.
>
> Releases the dev_t minor when all references are closed to prevent
> another device from acquiring the same major/minor.
>
> Since the partition's release may be invoked from call_rcu's soft-irq
> context, the ext_dev_idr's mutex had to be replaced with a spinlock so
> as not so sleep.
>
> Signed-off-by: Keith Busch <keith.busch@intel.com>
> Signed-off-by: Jens Axboe <axboe@fb.com>
> [bwh: Backported to 3.2:
>   - Adjust filename
>   - idr insertion API is different, and blk_alloc_devt() is preallocating
>     a node in a different way]

As I've noted for pretty much every stable branch so far, you have to 
backport commit 46f341ffcfb5 as well, if you backport this one.

-- 
Jens Axboe