linux-kernel - [PATCH 2/2] mtd: nand: complain loudly when chip->bits_per

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Date:   Tue, 29 Aug 2017 12:17:13 +0200
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Cc:     Lothar Waßmann <LW@...O-electronics.de>
Subject: [PATCH 2/2] 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@...O-electronics.de>
---
 include/linux/mtd/rawnand.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 94feece..2b05f42 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;
 }
 
-- 
2.1.4