Messages in this thread Patch in this message | | | From | Andrey Smirnov <> | Subject | [PATCH 1/2] mtd: nand: BUG_ON in case of no select_chip and cmd_ctrl | Date | Tue, 19 Jul 2016 08:41:43 -0700 |
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If no user specified chip->select_chip() function is provided, code in nand_base.c will automatically set this hook to nand_select_chip(), which in turn depends on chip->cmd_ctrl() hook being valid. Not providing both of those functions in NAND controller driver (for example by mistake) will result in a bit cryptic segfault. Replace it with explicit BUG_ON statement so it would be obvious what went wrong.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> --- drivers/mtd/nand/nand_base.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ce7b2ca..57043a6 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3128,8 +3128,10 @@ static void nand_set_defaults(struct nand_chip *chip, int busw) if (chip->waitfunc == NULL) chip->waitfunc = nand_wait; - if (!chip->select_chip) + if (!chip->select_chip) { + BUG_ON(!chip->cmd_ctrl); chip->select_chip = nand_select_chip; + } /* set for ONFI nand */ if (!chip->onfi_set_features) -- 2.5.5
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