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2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/drivers/mtd/ubi/build.c
....@@ -1,20 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Copyright (c) International Business Machines Corp., 2006
34  * Copyright (c) Nokia Corporation, 2007
4
- *
5
- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
7
- * the Free Software Foundation; either version 2 of the License, or
8
- * (at your option) any later version.
9
- *
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- * This program is distributed in the hope that it will be useful,
11
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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- * the GNU General Public License for more details.
14
- *
15
- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
185  *
196  * Author: Artem Bityutskiy (Битюцкий Артём),
207  *         Frank Haverkamp
....@@ -363,9 +350,6 @@
363350 	 * we still can use 'ubi->ubi_num'.
364351 	 */
365352 	ubi = container_of(dev, struct ubi_device, dev);
366
-	ubi = ubi_get_device(ubi->ubi_num);
367
-	if (!ubi)
368
-		return -ENODEV;
369353 
370354 	if (attr == &dev_eraseblock_size)
371355 		ret = sprintf(buf, "%d\n", ubi->leb_size);
....@@ -394,7 +378,6 @@
394378 	else
395379 		ret = -EINVAL;
396380 
397
-	ubi_put_device(ubi);
398381 	return ret;
399382 }
400383 
....@@ -516,19 +499,40 @@
516499 }
517500 
518501 /**
502
+ * ubi_free_volumes_from - free volumes from specific index.
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+ * @ubi: UBI device description object
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+ * @from: the start index used for volume free.
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+ */
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+static void ubi_free_volumes_from(struct ubi_device *ubi, int from)
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+{
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+	int i;
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+
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+	for (i = from; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
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+		if (!ubi->volumes[i])
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+			continue;
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+		ubi_eba_replace_table(ubi->volumes[i], NULL);
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+		ubi_fastmap_destroy_checkmap(ubi->volumes[i]);
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+		kfree(ubi->volumes[i]);
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+		ubi->volumes[i] = NULL;
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+	}
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+}
519
+
520
+/**
521
+ * ubi_free_all_volumes - free all volumes.
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+ * @ubi: UBI device description object
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+ */
524
+void ubi_free_all_volumes(struct ubi_device *ubi)
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+{
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+	ubi_free_volumes_from(ubi, 0);
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+}
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+
529
+/**
519530  * ubi_free_internal_volumes - free internal volumes.
520531  * @ubi: UBI device description object
521532  */
522533 void ubi_free_internal_volumes(struct ubi_device *ubi)
523534 {
524
-	int i;
525
-
526
-	for (i = ubi->vtbl_slots;
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-	     i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
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-		ubi_eba_replace_table(ubi->volumes[i], NULL);
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-		ubi_fastmap_destroy_checkmap(ubi->volumes[i]);
530
-		kfree(ubi->volumes[i]);
531
-	}
535
+	ubi_free_volumes_from(ubi, ubi->vtbl_slots);
532536 }
533537 
534538 static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
....@@ -859,8 +863,11 @@
859863 	 * Both UBI and UBIFS have been designed for SLC NAND and NOR flashes.
860864 	 * MLC NAND is different and needs special care, otherwise UBI or UBIFS
861865 	 * will die soon and you will lose all your data.
866
+	 * Relax this rule if the partition we're attaching to operates in SLC
867
+	 * mode.
862868 	 */
863
-	if (mtd->type == MTD_MLCNANDFLASH) {
869
+	if (mtd->type == MTD_MLCNANDFLASH &&
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+	    !(mtd->flags & MTD_SLC_ON_MLC_EMULATION)) {
864871 		pr_err("ubi: refuse attaching mtd%d - MLC NAND is not supported\n",
865872 			mtd->index);
866873 		return -EINVAL;
....@@ -969,9 +976,6 @@
969976 			goto out_detach;
970977 	}
971978 
972
-	/* Make device "available" before it becomes accessible via sysfs */
973
-	ubi_devices[ubi_num] = ubi;
974
-
975979 	err = uif_init(ubi);
976980 	if (err)
977981 		goto out_detach;
....@@ -1016,6 +1020,7 @@
10161020 	wake_up_process(ubi->bgt_thread);
10171021 	spin_unlock(&ubi->wl_lock);
10181022 
1023
+	ubi_devices[ubi_num] = ubi;
10191024 	ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
10201025 	return ubi_num;
10211026 
....@@ -1024,9 +1029,8 @@
10241029 out_uif:
10251030 	uif_close(ubi);
10261031 out_detach:
1027
-	ubi_devices[ubi_num] = NULL;
10281032 	ubi_wl_close(ubi);
1029
-	ubi_free_internal_volumes(ubi);
1033
+	ubi_free_all_volumes(ubi);
10301034 	vfree(ubi->vtbl);
10311035 out_free:
10321036 	vfree(ubi->peb_buf);
....@@ -1172,7 +1176,7 @@
11721176 		 * MTD device name.
11731177 		 */
11741178 		mtd = get_mtd_device_nm(mtd_dev);
1175
-		if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV)
1179
+		if (PTR_ERR(mtd) == -ENODEV)
11761180 			/* Probably this is an MTD character device node path */
11771181 			mtd = open_mtd_by_chdev(mtd_dev);
11781182 	} else
....@@ -1334,8 +1338,10 @@
13341338 	switch (*endp) {
13351339 	case 'G':
13361340 		result *= 1024;
1341
+		fallthrough;
13371342 	case 'M':
13381343 		result *= 1024;
1344
+		fallthrough;
13391345 	case 'K':
13401346 		result *= 1024;
13411347 		if (endp[1] == 'i' && endp[2] == 'B')
....@@ -1463,3 +1469,4 @@
14631469 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
14641470 MODULE_AUTHOR("Artem Bityutskiy");
14651471 MODULE_LICENSE("GPL");
1472
+MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);