linux-kernel - Re: [PATCH 1/2] mlx4: allow device removal by fixing dma unmap size

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Message-Id: <20120206.144249.2096673389778792309.davem@davemloft.net>
Date:	Mon, 06 Feb 2012 14:42:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	cascardo@...ux.vnet.ibm.com
Cc:	yevgenyp@...lanox.co.il, ogerlitz@...lanox.com,
	eugenia@...lanox.co.il, alexg@...lanox.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mlx4: allow device removal by fixing dma unmap size

From: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Date: Mon,  6 Feb 2012 16:39:49 -0200

> After opening the network interface, Mellanox ConnectX device cannot be
> removed by hotplug because it has not properly unmapped all DMA memory.
> 
> It happens that mlx4_en_activate_rx_rings overrides the variable that
> keeps the size of the memory mapped.
> 
> This is fixed by passing to mlx4_en_destroy_rx_ring the same size that is
> given to mlx4_en_create_rx_ring.
> 
> After applying this patch, hot unplugging the device works after opening
> the interface.
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>

Applied.
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