openwrt/target/linux/ath25/patches-5.15/141-redboot_partition_scan.patch

--- a/drivers/mtd/parsers/redboot.c
+++ b/drivers/mtd/parsers/redboot.c
@@ -94,12 +94,18 @@ static int parse_redboot_partitions(stru
 
 	parse_redboot_of(master);
 
+	buf = vmalloc(master->erasesize);
+	if (!buf)
+		return -ENOMEM;
+
+restart:
 	if (directory < 0) {
 		offset = master->size + directory * master->erasesize;
 		while (mtd_block_isbad(master, offset)) {
 			if (!offset) {
 nogood:
 				pr_notice("Failed to find a non-bad block to check for RedBoot partition table\n");
+				vfree(buf);
 				return -EIO;
 			}
 			offset -= master->erasesize;
@@ -112,10 +118,6 @@ nogood:
 				goto nogood;
 		}
 	}
-	buf = vmalloc(master->erasesize);
-
-	if (!buf)
-		return -ENOMEM;
 
 	pr_notice("Searching for RedBoot partition table in %s at offset 0x%lx\n",
 		  master->name, offset);
@@ -187,6 +189,11 @@ nogood:
 	}
 	if (i == numslots) {
 		/* Didn't find it */
+		if (offset + master->erasesize < master->size) {
+			/* not at the end of the flash yet, maybe next block */
+			directory++;
+			goto restart;
+		}
 		pr_notice("No RedBoot partition table detected in %s\n",
 			  master->name);
 		ret = 0;