Subject: [PATCH] mtd: fix calculating partition end address
From: Rafał Miłecki <[email-masked]>
Date: Mon, 9 Mar 2020 08:30:19 +0100

This fixes check for partitions that don't start at beginning of their
parents. Missing partition's offset in formula could result in forcing
read-only incorrectly.

Fixes: 6750f61a13a0 ("mtd: improve calculating partition boundaries when checking for alignment")
Signed-off-by: Rafał Miłecki <[email-masked]>
---
 drivers/mtd/mtdpart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -524,7 +524,7 @@ static struct mtd_part *allocate_partiti
 			part->name);
 	}
 
-	tmp = part_absolute_offset(parent) + slave->mtd.size;
+	tmp = part_absolute_offset(parent) + slave->offset + slave->mtd.size;
 	remainder = do_div(tmp, wr_alignment);
 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
 		slave->mtd.flags &= ~MTD_WRITEABLE;