Re: [PATCH] mtd: rawnand: ingenic: Fix ingenic_ecc dependency

From: Paul Cercueil <paul@crapouillou.net>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>,
	od@zcrc.me, linux-mtd@lists.infradead.org,
	linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Hulk Robot <hulkci@huawei.com>,
	YueHaibing <yuehaibing@huawei.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH] mtd: rawnand: ingenic: Fix ingenic_ecc dependency
Date: Mon, 01 Jul 2019 14:34:07 +0200	[thread overview]
Message-ID: <1561984447.1999.0@crapouillou.net> (raw)
In-Reply-To: <20190701142847.1c1ac4b1@xps13>

Le lun. 1 juil. 2019 à 14:28, Miquel Raynal 
<miquel.raynal@bootlin.com> a écrit :
> Hi Paul,
> 
> One question below.
> 
> Paul Cercueil <paul@crapouillou.net> wrote on Sat, 29 Jun 2019 
> 03:22:48
> +0200:
> 
>>  If MTD_NAND_JZ4780 is y and MTD_NAND_JZ4780_BCH is m,
>>  which select CONFIG_MTD_NAND_INGENIC_ECC to m, building fails:
>> 
>>  drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
>> `ingenic_nand_remove':
>>  ingenic_nand.c:(.text+0x177): undefined reference to 
>> `ingenic_ecc_release'
>>  drivers/mtd/nand/raw/ingenic/ingenic_nand.o: In function 
>> `ingenic_nand_ecc_correct':
>>  ingenic_nand.c:(.text+0x2ee): undefined reference to 
>> `ingenic_ecc_correct'
>> 
>>  To fix that, the ingenic_nand and ingenic_ecc modules have been 
>> fused
>>  into one single module.
>>  - The ingenic_ecc.c code is now compiled in only if
>>    $(CONFIG_MTD_NAND_INGENIC_ECC) is set. This is now a boolean 
>> instead
>>    of tristate.
>>  - To avoid changing the module name, the ingenic_nand.c file is 
>> moved to
>>    ingenic_nand_drv.c. Then the module name is still ingenic_nand.
>>  - Since ingenic_ecc.c is no more a module, the module-specific 
>> macros
>>    have been dropped, and the functions are no more exported for use 
>> by
>>    the ingenic_nand driver.
> 
> I am fine with this approach.
> 
>> 
>>  Fixes: 15de8c6efd0e ("mtd: rawnand: ingenic: Separate top-level and 
>> SoC specific code")
>>  Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>>  Reported-by: Arnd Bergmann <arnd@arndb.de>
>>  Reported-by: Hulk Robot <hulkci@huawei.com>
>>  Cc: YueHaibing <yuehaibing@huawei.com>
>>  Cc: stable@vger.kernel.org
>>  ---
>>   drivers/mtd/nand/raw/ingenic/Kconfig                     | 2 +-
>>   drivers/mtd/nand/raw/ingenic/Makefile                    | 4 +++-
>>   drivers/mtd/nand/raw/ingenic/ingenic_ecc.c               | 9 
>> ---------
>>   .../raw/ingenic/{ingenic_nand.c => ingenic_nand_drv.c}   | 0
>>   4 files changed, 4 insertions(+), 11 deletions(-)
>>   rename drivers/mtd/nand/raw/ingenic/{ingenic_nand.c => 
>> ingenic_nand_drv.c} (100%)
>> 
>>  diff --git a/drivers/mtd/nand/raw/ingenic/Kconfig 
>> b/drivers/mtd/nand/raw/ingenic/Kconfig
>>  index 19a96ce515c1..66b7cffdb0c2 100644
>>  --- a/drivers/mtd/nand/raw/ingenic/Kconfig
>>  +++ b/drivers/mtd/nand/raw/ingenic/Kconfig
>>  @@ -16,7 +16,7 @@ config MTD_NAND_JZ4780
>>   if MTD_NAND_JZ4780
>> 
>>   config MTD_NAND_INGENIC_ECC
>>  -	tristate
>>  +	bool
>> 
>>   config MTD_NAND_JZ4740_ECC
>>   	tristate "Hardware BCH support for JZ4740 SoC"
>>  diff --git a/drivers/mtd/nand/raw/ingenic/Makefile 
>> b/drivers/mtd/nand/raw/ingenic/Makefile
>>  index 1ac4f455baea..b63d36889263 100644
>>  --- a/drivers/mtd/nand/raw/ingenic/Makefile
>>  +++ b/drivers/mtd/nand/raw/ingenic/Makefile
>>  @@ -2,7 +2,9 @@
>>   obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
>>   obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_nand.o
>> 
>>  -obj-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
>>  +ingenic_nand-y += ingenic_nand_drv.o
>>  +ingenic_nand-$(CONFIG_MTD_NAND_INGENIC_ECC) += ingenic_ecc.o
>>  +
>>   obj-$(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
>>  diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c 
>> b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
>>  index d3e085c5685a..c954189606f6 100644
>>  --- a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
>>  +++ b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
>>  @@ -30,7 +30,6 @@ int ingenic_ecc_calculate(struct ingenic_ecc *ecc,
>>   {
>>   	return ecc->ops->calculate(ecc, params, buf, ecc_code);
>>   }
>>  -EXPORT_SYMBOL(ingenic_ecc_calculate);
>> 
>>   /**
>>    * ingenic_ecc_correct() - detect and correct bit errors
>>  @@ -51,7 +50,6 @@ int ingenic_ecc_correct(struct ingenic_ecc *ecc,
>>   {
>>   	return ecc->ops->correct(ecc, params, buf, ecc_code);
>>   }
>>  -EXPORT_SYMBOL(ingenic_ecc_correct);
>> 
>>   /**
>>    * ingenic_ecc_get() - get the ECC controller device
>>  @@ -111,7 +109,6 @@ struct ingenic_ecc *of_ingenic_ecc_get(struct 
>> device_node *of_node)
>>   	}
>>   	return ecc;
>>   }
>>  -EXPORT_SYMBOL(of_ingenic_ecc_get);
>> 
>>   /**
>>    * ingenic_ecc_release() - release the ECC controller device
>>  @@ -122,7 +119,6 @@ void ingenic_ecc_release(struct ingenic_ecc 
>> *ecc)
>>   	clk_disable_unprepare(ecc->clk);
>>   	put_device(ecc->dev);
>>   }
>>  -EXPORT_SYMBOL(ingenic_ecc_release);
>> 
>>   int ingenic_ecc_probe(struct platform_device *pdev)
>>   {
>>  @@ -159,8 +155,3 @@ int ingenic_ecc_probe(struct platform_device 
>> *pdev)
>>   	return 0;
>>   }
>>   EXPORT_SYMBOL(ingenic_ecc_probe);
> 
> Any reason to keep this one?

This one is called from the three ECC drivers, which can be modules,
so it still needs to be exported.

-Paul