[PATCH -next] mtd: ftl: use container_of() rather than cast

[Gaosheng Cui]

The container_of() is much more readable and also safer.

Signed-off-by: Gaosheng Cui <cuigaosheng1 at huawei.com>
---
 drivers/mtd/ftl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c
index bec56070039d..7e56c77535e8 100644
--- a/drivers/mtd/ftl.c
+++ b/drivers/mtd/ftl.c
@@ -941,7 +941,7 @@ static int ftl_write(partition_t *part, caddr_t buffer,
 
 static int ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
 {
-	partition_t *part = (void *)dev;
+	partition_t *part = container_of(dev, struct partition_t, mbd);
 	u_long sect;
 
 	/* Sort of arbitrary: round size down to 4KiB boundary */
@@ -969,7 +969,7 @@ static int ftl_writesect(struct mtd_blktrans_dev *dev,
 static int ftl_discardsect(struct mtd_blktrans_dev *dev,
 			   unsigned long sector, unsigned nr_sects)
 {
-	partition_t *part = (void *)dev;
+	partition_t *part = container_of(dev, struct partition_t, mbd);
 	uint32_t bsize = 1 << part->header.EraseUnitSize;
 
 	pr_debug("FTL erase sector %ld for %d sectors\n",
-- 
2.25.1