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From 6750f61a13a0197c40e4a40739117493b15f19e8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 20 Nov 2018 10:24:09 +0100
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Subject: [PATCH] mtd: improve calculating partition boundaries when checking
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for alignment
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When checking for alignment mtd should check absolute offsets. It's
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important for subpartitions as it doesn't make sense to check their
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relative addresses.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
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---
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drivers/mtd/mtdpart.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -61,6 +61,15 @@ static inline struct mtd_part *mtd_to_pa
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return container_of(mtd, struct mtd_part, mtd);
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}
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+static u64 part_absolute_offset(struct mtd_info *mtd)
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+{
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+ struct mtd_part *part = mtd_to_part(mtd);
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+
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+ if (!mtd_is_partition(mtd))
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+ return 0;
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+
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+ return part_absolute_offset(part->parent) + part->offset;
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+}
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/*
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* MTD methods which simply translate the effective address and pass through
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@@ -514,7 +523,7 @@ static struct mtd_part *allocate_partiti
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if (!(slave->mtd.flags & MTD_NO_ERASE))
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wr_alignment = slave->mtd.erasesize;
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- tmp = slave->offset;
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+ tmp = part_absolute_offset(parent) + slave->offset;
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remainder = do_div(tmp, wr_alignment);
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if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
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/* Doesn't start on a boundary of major erase size */
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@@ -525,7 +534,7 @@ static struct mtd_part *allocate_partiti
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part->name);
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}
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- tmp = slave->mtd.size;
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+ tmp = part_absolute_offset(parent) + slave->mtd.size;
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remainder = do_div(tmp, wr_alignment);
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if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
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slave->mtd.flags &= ~MTD_WRITEABLE;
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