--- zzzz-none-000/linux-5.4.213/fs/pstore/pmsg.c	2022-09-15 10:04:56.000000000 +0000
+++ miami-7690-761/linux-5.4.213/fs/pstore/pmsg.c	2024-05-29 11:20:02.000000000 +0000
@@ -23,6 +23,7 @@
 	pstore_record_init(&record, psinfo);
 	record.type = PSTORE_TYPE_PMSG;
 	record.size = count;
+	record.part = iminor(file->f_inode);
 
 	/* check outside lock, page in any data. write_user also checks */
 	if (!access_ok(buf, count))
@@ -55,7 +56,7 @@
 
 void pstore_register_pmsg(void)
 {
-	struct device *pmsg_device;
+	int i;
 
 	pmsg_major = register_chrdev(0, PMSG_NAME, &pmsg_fops);
 	if (pmsg_major < 0) {
@@ -70,15 +71,23 @@
 	}
 	pmsg_class->devnode = pmsg_devnode;
 
-	pmsg_device = device_create(pmsg_class, NULL, MKDEV(pmsg_major, 0),
-					NULL, "%s%d", PMSG_NAME, 0);
-	if (IS_ERR(pmsg_device)) {
-		pr_err("failed to create device\n");
-		goto err_device;
+	/* allocate each pmsg device */
+	for (i = 0; i < psinfo->num_pmsg; i++) {
+		struct device *pmsg_device;
+
+		pmsg_device =
+			device_create(pmsg_class, NULL, MKDEV(pmsg_major, i),
+				      NULL, "%s%d", PMSG_NAME, i);
+		if (IS_ERR(pmsg_device)) {
+			pr_err("failed to create device %s%d\n", PMSG_NAME, i);
+			goto err_device;
+		}
 	}
 	return;
 
 err_device:
+	for (i--; i >= 0; i--)
+		device_destroy(pmsg_class, MKDEV(pmsg_major, i));
 	class_destroy(pmsg_class);
 err_class:
 	unregister_chrdev(pmsg_major, PMSG_NAME);