[SG] Update drivers to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/scsi/megaraid.c

@@ -658,7 +658,7 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
 			struct scatterlist *sg;
 
 			sg = scsi_sglist(cmd);
-			buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
 
 			memset(buf, 0, cmd->cmnd[4]);
 			kunmap_atomic(buf - sg->offset, KM_IRQ0);
@@ -1542,10 +1542,8 @@ mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
 		if( cmd->cmnd[0] == INQUIRY && !islogical ) {
 
 			sgl = scsi_sglist(cmd);
-			if( sgl->page ) {
-				c = *(unsigned char *)
-					page_address((&sgl[0])->page) +
-					(&sgl[0])->offset; 
+			if( sg_page(sgl) ) {
+				c = *(unsigned char *) sg_virt(&sgl[0]);
 			} else {
 				printk(KERN_WARNING
 				       "megaraid: invalid sg.\n");