s390 zfcp: sg fixups

Based on initial patch from Heiko Carstens <heiko.carstens@de.ibm.com>

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

drivers/s390/scsi/zfcp_aux.c

@@ -559,6 +559,7 @@ zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
 		retval = -ENOMEM;
 		goto out;
 	}
+	sg_init_table(sg_list->sg, sg_list->count);
 
 	for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
 		sg->length = min(size, PAGE_SIZE);

drivers/s390/scsi/zfcp_def.h

@@ -63,7 +63,7 @@
 static inline void *
 zfcp_sg_to_address(struct scatterlist *list)
 {
-	return (void *) (page_address(list->page) + list->offset);
+	return sg_virt(list);
 }
 
 /**
@@ -74,7 +74,7 @@ zfcp_sg_to_address(struct scatterlist *list)
 static inline void
 zfcp_address_to_sg(void *address, struct scatterlist *list)
 {
-	list->page = virt_to_page(address);
+	sg_set_page(list, virt_to_page(address));
 	list->offset = ((unsigned long) address) & (PAGE_SIZE - 1);
 }
 

drivers/s390/scsi/zfcp_erp.c

@@ -308,13 +308,15 @@ zfcp_erp_adisc(struct zfcp_port *port)
 	if (send_els == NULL)
 		goto nomem;
 
-	send_els->req = kzalloc(sizeof(struct scatterlist), GFP_ATOMIC);
+	send_els->req = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
 	if (send_els->req == NULL)
 		goto nomem;
+	sg_init_table(send_els->req, 1);
 
-	send_els->resp = kzalloc(sizeof(struct scatterlist), GFP_ATOMIC);
+	send_els->resp = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
 	if (send_els->resp == NULL)
 		goto nomem;
+	sg_init_table(send_els->resp, 1);
 
 	address = (void *) get_zeroed_page(GFP_ATOMIC);
 	if (address == NULL)
@@ -363,7 +365,7 @@ zfcp_erp_adisc(struct zfcp_port *port)
 	retval = -ENOMEM;
  freemem:
 	if (address != NULL)
-		__free_pages(send_els->req->page, 0);
+		__free_pages(sg_page(send_els->req), 0);
 	if (send_els != NULL) {
 		kfree(send_els->req);
 		kfree(send_els->resp);
@@ -437,7 +439,7 @@ zfcp_erp_adisc_handler(unsigned long data)
 
  out:
 	zfcp_port_put(port);
-	__free_pages(send_els->req->page, 0);
+	__free_pages(sg_page(send_els->req), 0);
 	kfree(send_els->req);
 	kfree(send_els->resp);
 	kfree(send_els);