linux-kernel - Re: [PATCH] mtd: rawnand: ingenic: fix ingenic

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Date:   Mon, 17 Jun 2019 13:24:04 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: ingenic: fix ingenic_ecc dependency

Hi Arnd,


Le lun. 17 juin 2019 à 13:10, Arnd Bergmann <arnd@...db.de> a écrit :
> The ecc code is called from the main ingenic_nand module, but the
> Kconfig symbol gets selected by the dependent ones.
> 
> If the child drivers are loadable modules, this leads to a link
> error:
> 
> drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
> `ingenic_nand_remove':
> ingenic_nand.c:(.text+0x1a1): undefined reference to 
> `ingenic_ecc_release'
> drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
> `ingenic_nand_ecc_correct':
> ingenic_nand.c:(.text+0x1fa): undefined reference to 
> `ingenic_ecc_correct'
> drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
> `ingenic_nand_ecc_calculate':
> ingenic_nand.c:(.text+0x255): undefined reference to 
> `ingenic_ecc_calculate'
> drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
> `ingenic_nand_probe':
> ingenic_nand.c:(.text+0x3ca): undefined reference to 
> `of_ingenic_ecc_get'
> ingenic_nand.c:(.text+0x685): undefined reference to 
> `ingenic_ecc_release'
> 
> Rearrange this to have the ecc code linked the same way as the main
> driver.

I think there's a better way to fix it, only in Kconfig.

* Add a bool symbol MTD_NAND_INGENIC_USE_HW_ECC
* Have the three ECC/BCH drivers select this symbol instead of
  MTD_NAND_INGENIC_ECC
* Add the following to the MTD_NAND_JZ4780 config option:
  "select MTD_NAND_INGENIC_ECC if MTD_NAND_INGENIC_USE_HW_ECC"


> Fixes: 15de8c6efd0e ("mtd: rawnand: ingenic: Separate top-level and 
> SoC specific code")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/mtd/nand/raw/ingenic/Kconfig  | 2 +-
>  drivers/mtd/nand/raw/ingenic/Makefile | 5 ++++-
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/ingenic/Kconfig 
> b/drivers/mtd/nand/raw/ingenic/Kconfig
> index 19a96ce515c1..66b7cffdb0c2 100644
> --- a/drivers/mtd/nand/raw/ingenic/Kconfig
> +++ b/drivers/mtd/nand/raw/ingenic/Kconfig
> @@ -16,7 +16,7 @@ config MTD_NAND_JZ4780
>  if MTD_NAND_JZ4780
> 
>  config MTD_NAND_INGENIC_ECC
> -	tristate
> +	bool
> 
>  config MTD_NAND_JZ4740_ECC
>  	tristate "Hardware BCH support for JZ4740 SoC"
> diff --git a/drivers/mtd/nand/raw/ingenic/Makefile 
> b/drivers/mtd/nand/raw/ingenic/Makefile
> index 1ac4f455baea..5a55efc5d9bb 100644
> --- a/drivers/mtd/nand/raw/ingenic/Makefile
> +++ b/drivers/mtd/nand/raw/ingenic/Makefile
> @@ -2,7 +2,10 @@
>  obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
>  obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_nand.o
> 
> -obj-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
> +ifdef CONFIG_MTD_NAND_INGENIC_ECC
> +obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_ecc.o
> +endif
> +
>  obj-$(CONFIG_MTD_NAND_JZ4740_ECC) += jz4740_ecc.o
>  obj-$(CONFIG_MTD_NAND_JZ4725B_BCH) += jz4725b_bch.o
>  obj-$(CONFIG_MTD_NAND_JZ4780_BCH) += jz4780_bch.o
> --
> 2.20.0
>