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This patch handles SCSI dma mapping failure case. Reporting error code to the upper layer instead of BUG_ON(). Signed-off-by: Mahesh Rajashekhara <Mahesh_Rajashekhara@pmc-sierra.com> Reviewed-by: Tomas Henzl <thenzl@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>