From 5eed69ffd248c9f68f56c710caf07db134aef28b Mon Sep 17 00:00:00 2001
From: Dwight Engen <dwight.engen@oracle.com>
Date: Fri, 19 Sep 2014 09:42:53 -0400
Subject: [PATCH] sunvdc: limit each sg segment to a page

ldc_map_sg() could fail its check that the number of pages referred to
by the sg scatterlist was <= the number of cookies.

This fixes the issue by doing a similar thing to the xen-blkfront driver,
ensuring that the scatterlist will only ever contain a segment count <=
port->ring_cookies, and each segment will be page aligned, and <= page
size. This ensures that the scatterlist is always mappable.

Orabug: 19347817
OraBZ: 15945

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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