[PATCH 5.15 159/935] s390/dasd: Guard sysfs discipline callbacks against unallocated private data

@@ -1519,6 +1519,8 @@ static void dasd_eckd_reset_path(struct
 	struct dasd_eckd_private *private = device->private;
 	unsigned long flags;
 
+	if (!private)
+		return;
 	if (!private->fcx_max_data)
 		private->fcx_max_data = get_fcx_max_data(device);
 	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);

@@ -1674,6 +1676,9 @@ static int dasd_eckd_is_ese(struct dasd_
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->vsq.vol_info.ese;
 }
 

@@ -1681,6 +1686,9 @@ static int dasd_eckd_ext_pool_id(struct
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->vsq.extent_pool_id;
 }
 

@@ -1694,6 +1702,9 @@ static int dasd_eckd_space_configured(st
 	struct dasd_eckd_private *private = device->private;
 	int rc;
 
+	if (!private)
+		return 0;
+
 	rc = dasd_eckd_read_vol_info(device);
 
 	return rc ? : private->vsq.space_configured;

@@ -1708,6 +1719,9 @@ static int dasd_eckd_space_allocated(str
 	struct dasd_eckd_private *private = device->private;
 	int rc;
 
+	if (!private)
+		return 0;
+
 	rc = dasd_eckd_read_vol_info(device);
 
 	return rc ? : private->vsq.space_allocated;

@@ -1717,6 +1731,9 @@ static int dasd_eckd_logical_capacity(st
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->vsq.logical_capacity;
 }
 

@@ -1859,7 +1876,11 @@ static int dasd_eckd_read_ext_pool_info(
 static int dasd_eckd_ext_size(struct dasd_device *device)
 {
 	struct dasd_eckd_private *private = device->private;
-	struct dasd_ext_pool_sum eps = private->eps;
+	struct dasd_ext_pool_sum eps;
+
+	if (!private)
+		return 0;
+	eps = private->eps;
 
 	if (!eps.flags.extent_size_valid)
 		return 0;

@@ -1875,6 +1896,9 @@ static int dasd_eckd_ext_pool_warn_thrsh
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->eps.warn_thrshld;
 }
 

@@ -1882,6 +1906,9 @@ static int dasd_eckd_ext_pool_cap_at_war
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->eps.flags.capacity_at_warnlevel;
 }
 

@@ -1892,6 +1919,9 @@ static int dasd_eckd_ext_pool_oos(struct
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->eps.flags.pool_oos;
 }
 

@@ -5977,8 +6007,11 @@ static int dasd_eckd_query_host_access(s
 	struct ccw1 *ccw;
 	int rc;
 
+	if (!private)
+		return -ENODEV;
+
 	/* not available for HYPER PAV alias devices */
-	if (!device->block && private->lcu->pav == HYPER_PAV)
+	if (!device->block && private->lcu && private->lcu->pav == HYPER_PAV)
 		return -EOPNOTSUPP;
 
 	/* may not be supported by the storage server */

@@ -6683,6 +6716,9 @@ static int dasd_eckd_hpf_enabled(struct
 {
 	struct dasd_eckd_private *private = device->private;
 
+	if (!private)
+		return 0;
+
 	return private->fcx_max_data ? 1 : 0;
 }