From 6750f61a13a0197c40e4a40739117493b15f19e8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Tue, 20 Nov 2018 10:24:09 +0100 Subject: [PATCH] mtd: improve calculating partition boundaries when checking for alignment MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When checking for alignment mtd should check absolute offsets. It's important for subpartitions as it doesn't make sense to check their relative addresses. Signed-off-by: Rafał Miłecki Signed-off-by: Boris Brezillon --- drivers/mtd/mtdpart.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -61,6 +61,15 @@ static inline struct mtd_part *mtd_to_pa return container_of(mtd, struct mtd_part, mtd); } +static u64 part_absolute_offset(struct mtd_info *mtd) +{ + struct mtd_part *part = mtd_to_part(mtd); + + if (!mtd_is_partition(mtd)) + return 0; + + return part_absolute_offset(part->parent) + part->offset; +} /* * MTD methods which simply translate the effective address and pass through @@ -518,7 +527,7 @@ static struct mtd_part *allocate_partiti if (!(slave->mtd.flags & MTD_NO_ERASE)) wr_alignment = slave->mtd.erasesize; - tmp = slave->offset; + tmp = part_absolute_offset(parent) + slave->offset; remainder = do_div(tmp, wr_alignment); if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { /* Doesn't start on a boundary of major erase size */ @@ -529,7 +538,7 @@ static struct mtd_part *allocate_partiti part->name); } - tmp = slave->mtd.size; + tmp = part_absolute_offset(parent) + slave->mtd.size; remainder = do_div(tmp, wr_alignment); if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { slave->mtd.flags &= ~MTD_WRITEABLE;