scsi: target: core: UA on all LUNs after reset

Allocate UNIT ATTENTION "BUS DEVICE RESET OCCURRED" on all LUNs on all
target ports of the device upon reception of TMF LUN RESET.

This change passes libiscsi test SCSI.MultipathIO.Reset.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Bogdanov <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/target/target_core_device.c

···
 	complete(&deve->pr_comp);
 }
 
+/*
+ * Establish UA condition on SCSI device - all LUNs
+ */
+void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq)
+{
+	struct se_dev_entry *se_deve;
+	struct se_lun *lun;
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) {
+
+		spin_lock(&lun->lun_deve_lock);
+		list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
+			core_scsi3_ua_allocate(se_deve, asc, ascq);
+		spin_unlock(&lun->lun_deve_lock);
+	}
+	spin_unlock(&dev->se_port_lock);
+}
+
 static void
 target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
 			     bool skip_new)

drivers/target/target_core_internal.h

···
 void	target_free_device(struct se_device *);
 int	target_for_each_device(int (*fn)(struct se_device *dev, void *data),
 			       void *data);
+void	target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq);
 
 /* target_core_configfs.c */
 extern struct configfs_item_operations target_core_dev_item_ops;

drivers/target/target_core_transport.c

···
 		tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
 					 TMR_FUNCTION_REJECTED;
 		if (tmr->response == TMR_FUNCTION_COMPLETE) {
-			target_ua_allocate_lun(cmd->se_sess->se_node_acl,
-					       cmd->orig_fe_lun, 0x29,
+			target_dev_ua_allocate(dev, 0x29,
 					       ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
 		}
 		break;