diff options
Diffstat (limited to 'target/linux/generic/backport-4.19/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch')
| -rw-r--r-- | target/linux/generic/backport-4.19/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.19/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch b/target/linux/generic/backport-4.19/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch new file mode 100644 index 0000000000..58163e6935 --- /dev/null +++ b/target/linux/generic/backport-4.19/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch @@ -0,0 +1,55 @@ +From 6750f61a13a0197c40e4a40739117493b15f19e8 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +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 <rafal@milecki.pl> +Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> +--- + 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 +@@ -562,7 +571,7 @@ 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 */ +@@ -573,7 +582,7 @@ 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; |