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authorBoris Brezillon <boris.brezillon@free-electrons.com>2017-09-25 10:19:57 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-05 09:47:34 +0200
commitd45d8cd4717dd954ad338f5a0fc3652e93fbb2a2 (patch)
tree6ef9c00c134880f2cc07138f341ff9fe3d274c3f
parent2cfa35c2f21437421d6afeda3be7d7341d2b15af (diff)
mtd: Fix partition alignment check on multi-erasesize devices
commit 7e439681af82984045efc215437ebb2ca8d33a4c upstream. Commit 1eeef2d7483a ("mtd: handle partitioning on devices with 0 erasesize") introduced a regression on heterogeneous erase region devices. Alignment of the partition was tested against the master eraseblock size which can be bigger than the slave one, thus leading to some partitions being marked as read-only. Update wr_alignment to match this slave erasesize after this erasesize has been determined by picking the biggest erasesize of all the regions embedded in the MTD partition. Reported-by: Mathias Thore <Mathias.Thore@infinera.com> Fixes: 1eeef2d7483a ("mtd: handle partitioning on devices with 0 erasesize") Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Tested-by: Mathias Thore <Mathias.Thore@infinera.com> Reviewed-by: Mathias Thore <Mathias.Thore@infinera.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/mtd/mtdpart.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 5736b0c90b33..a308e707392d 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -581,6 +581,14 @@ static struct mtd_part *allocate_partition(struct mtd_info *parent,
slave->mtd.erasesize = parent->erasesize;
}
+ /*
+ * Slave erasesize might differ from the master one if the master
+ * exposes several regions with different erasesize. Adjust
+ * wr_alignment accordingly.
+ */
+ if (!(slave->mtd.flags & MTD_NO_ERASE))
+ wr_alignment = slave->mtd.erasesize;
+
tmp = slave->offset;
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {