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authorBoris Brezillon <boris.brezillon@free-electrons.com>2017-09-25 10:19:57 +0200
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-09-27 13:53:20 +0200
commit7e439681af82984045efc215437ebb2ca8d33a4c (patch)
tree9b34070bcc851facbc3ca6fbd403a1fef683b9d2
parent73600b619bf8b9803a0610624a0e11f5ed8f761e (diff)
mtd: Fix partition alignment check on multi-erasesize devices
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") Cc: <stable@vger.kernel.org> 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>
-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) {