mtd: nand: complain loudly when chip->bits_per_cell is not correctly initialized

chip->bits_per_cell which is used to determine the NAND cell type
(SLC/MLC) should always have a value != 0.
Complain loudly if the value is 0 in nand_is_slc() to catch use before
correct initialization.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 8fb488d586d6..c433f093766a 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1234,6 +1234,8 @@ int onfi_init_data_interface(struct nand_chip *chip,
  */
 static inline bool nand_is_slc(struct nand_chip *chip)
 {
+        WARN(chip->bits_per_cell == 0,
+             "chip->bits_per_cell is used uninitialized\n");
         return chip->bits_per_cell == 1;
 }