[PATCH v2 10/46] mtd: nandsim: Add helper functions for pointer magic

[Daniel Walter]

From: Richard Weinberger <rich...@nod.at>

Add chip_to_ns() and ns_to_mtd() helper functions

Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 drivers/mtd/nand/nandsim.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index fda670b..f26e983 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -461,6 +461,18 @@ struct grave_page {
 /* MTD structure for NAND controller */
 static struct mtd_info *ns_mtds[NS_MAX_DEVICES];
 
+static inline struct nandsim *chip_to_ns(struct nand_chip *chip)
+{
+       return (struct nandsim *)(chip + 1);
+}
+
+static inline struct mtd_info *ns_to_mtd(struct nandsim *ns)
+{
+       struct nand_chip *chip = ((struct nand_chip *)ns - 1);
+
+       return nand_to_mtd(chip);
+}
+
 static int nandsim_debugfs_show(struct seq_file *m, void *private)
 {
        struct nandsim *ns = (struct nandsim *)m->private;
@@ -1462,8 +1474,7 @@ static int do_read_error(struct nandsim *ns, int num)
 
 static void do_bit_flips(struct nandsim *ns, int num)
 {
-       struct nand_chip *chip = ((struct nand_chip *)ns - 1);
-       struct mtd_info *nsmtd = nand_to_mtd(chip);
+       struct mtd_info *nsmtd = ns_to_mtd(ns);
 
        if (ns->bitflips && prandom_u32() < (1 << 22)) {
                int flips = 1;
@@ -2300,7 +2311,7 @@ static int __init ns_init_default(void)
 
        WARN_ON(ns_mtds[0]);
        nsmtd = ns_mtds[0] = nand_to_mtd(chip);
-       nand = (struct nandsim *)(chip + 1);
+       nand = chip_to_ns(chip);
        nand_set_controller_data(chip, (void *)nand);
 
        INIT_LIST_HEAD(&nand->weak_blocks);
-- 
2.8.3