linux-kernel - Re: [PATCH 06/62] block: fix synchronization and limit check in blk_alloc

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Message-ID: <20130206110046.GG15092@kernel.dk>
Date:	Wed, 6 Feb 2013 12:00:46 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	rusty@...tcorp.com.au, bfields@...ldses.org,
	skinsbursky@...allels.com, ebiederm@...ssion.com,
	jmorris@...ei.org, stable@...r.kernel.org
Subject: Re: [PATCH 06/62] block: fix synchronization and limit check in
 blk_alloc_devt()

On Sat, Feb 02 2013, Tejun Heo wrote:
> idr allocation in blk_alloc_devt() wasn't synchronized against lookup
> and removal, and its limit check was off by one - 1 << MINORBITS is
> the number of minors allowed, not the maximum allowed minor.
> 
> Add locking and rename MAX_EXT_DEVT to NR_EXT_DEVT and fix limit
> checking.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: stable@...r.kernel.org

Acked-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe

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