[SCSI] zfcp: Simplify get_adapter_by_busid

Call the helper function from cio instead looping through all zfcp
adapters.
Signed-off-by: NSwen Schillig <swen@vnet.ibm.com>
Signed-off-by: NChristof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/s390/scsi/zfcp_aux.c

@@ -106,19 +106,6 @@ static int __init zfcp_device_setup(char *devstr)
 	return 0;
 }
 
-static struct zfcp_adapter *zfcp_get_adapter_by_busid(char *bus_id)
-{
-	struct zfcp_adapter *adapter;
-
-	list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list)
-		if ((strncmp(bus_id, adapter->ccw_device->dev.bus_id,
-			     BUS_ID_SIZE) == 0) &&
-		    !(atomic_read(&adapter->status) &
-		      ZFCP_STATUS_COMMON_REMOVE))
-		    return adapter;
-	return NULL;
-}
-
 static void __init zfcp_init_device_configure(void)
 {
 	struct zfcp_adapter *adapter;

drivers/s390/scsi/zfcp_ccw.c

@@ -224,3 +224,20 @@ int __init zfcp_ccw_register(void)
 {
 	return ccw_driver_register(&zfcp_ccw_driver);
 }
+
+/**
+ * zfcp_get_adapter_by_busid - find zfcp_adapter struct
+ * @busid: bus id string of zfcp adapter to find
+ */
+struct zfcp_adapter *zfcp_get_adapter_by_busid(char *busid)
+{
+	struct ccw_device *ccw_device;
+	struct zfcp_adapter *adapter = NULL;
+
+	ccw_device = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
+	if (ccw_device) {
+		adapter = dev_get_drvdata(&ccw_device->dev);
+		put_device(&ccw_device->dev);
+	}
+	return adapter;
+}

drivers/s390/scsi/zfcp_ext.h

@@ -27,6 +27,7 @@ extern int zfcp_sg_setup_table(struct scatterlist *, int);
 
 /* zfcp_ccw.c */
 extern int zfcp_ccw_register(void);
+extern struct zfcp_adapter *zfcp_get_adapter_by_busid(char *);
 
 /* zfcp_cfdc.c */
 extern struct miscdevice zfcp_cfdc_misc;