[SG] Update drivers to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index a64153b..59716eb 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -1469,7 +1469,7 @@
 	struct scatterlist *sg = scsi_sglist(cmd);
 
 	local_irq_save(flags);
-	buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+	buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
 	transfer_len = min(sg->length, len);
 
 	memcpy(buf, data, transfer_len);