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