Dwight Engen 5eed69ffd2
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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