netdev - Re: [PATCH] mlx4_en: fix allocation of CPU affinity reverse-map

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Message-Id: <20130223.135429.1335162102680714009.davem@davemloft.net>
Date:	Sat, 23 Feb 2013 13:54:29 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	klebers@...ux.vnet.ibm.com
Cc:	amirv@...lanox.com, netdev@...r.kernel.org
Subject: Re: [PATCH] mlx4_en: fix allocation of CPU affinity reverse-map

From: Kleber Sacilotto de Souza <klebers@...ux.vnet.ibm.com>
Date: Sat, 23 Feb 2013 02:14:52 -0300

> The mlx4_en driver allocates the number of objects for the CPU affinity
> reverse-map based on the number of rx rings of the device. However,
> mlx4_assign_eq() calls irq_cpu_rmap_add() as many times as IRQ's are
> assigned to EQ's, which can be as large as mlx4_dev->caps.comp_pool. If
> caps.comp_pool is larger than rx_ring_num we will eventually hit the
> BUG_ON() in cpu_rmap_add().
> 
> Fix this problem by allocating space for the maximum number of CPU
> affinity reverse-map objects we might want to add.
> 
> Signed-off-by: Kleber Sacilotto de Souza <klebers@...ux.vnet.ibm.com>

Applied.
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