Re: [PATCH 2/2] mlx4: fix DMA mapping leak when allocation fails

From: David Miller
Date: Mon Feb 06 2012 - 14:43:14 EST

From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxxxxxxx>
Date: Mon, 6 Feb 2012 16:39:50 -0200

> mlx4_en_prepare_rx_desc does not correctly clean up after it finds an
> allocation failure. It should unmap a page before calling put_page, but
> it only calls the later.
> This bug would prevent a device removal using hotplug after setting the
> device MTU to 9000 and opening the network interface. After the fix, we
> still see the allocation failure with MTU 9000, but we are able to
> remove the device.
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxxxxxxx>

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