linux-kernel - Re: [PATCH] crypto: ccp -- don't "select" CONFIG

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Message-ID: <20200416065320.GJ7901@gondor.apana.org.au>
Date:   Thu, 16 Apr 2020 16:53:20 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Gary R Hook <gary.hook@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Eric Biggers <ebiggers@...gle.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: ccp -- don't "select" CONFIG_DMADEVICES

On Wed, Apr 08, 2020 at 06:26:48PM +0200, Arnd Bergmann wrote:
> DMADEVICES is the top-level option for the slave DMA
> subsystem, and should not be selected by device drivers,
> as this can cause circular dependencies such as:
> 
> drivers/net/ethernet/freescale/Kconfig:6:error: recursive dependency detected!
> drivers/net/ethernet/freescale/Kconfig:6:	symbol NET_VENDOR_FREESCALE depends on PPC_BESTCOMM
> drivers/dma/bestcomm/Kconfig:6:	symbol PPC_BESTCOMM depends on DMADEVICES
> drivers/dma/Kconfig:6:	symbol DMADEVICES is selected by CRYPTO_DEV_SP_CCP
> drivers/crypto/ccp/Kconfig:10:	symbol CRYPTO_DEV_SP_CCP depends on CRYPTO
> crypto/Kconfig:16:	symbol CRYPTO is selected by LIBCRC32C
> lib/Kconfig:222:	symbol LIBCRC32C is selected by LIQUIDIO
> drivers/net/ethernet/cavium/Kconfig:65:	symbol LIQUIDIO depends on PTP_1588_CLOCK
> drivers/ptp/Kconfig:8:	symbol PTP_1588_CLOCK is implied by FEC
> drivers/net/ethernet/freescale/Kconfig:23:	symbol FEC depends on NET_VENDOR_FREESCALE
> 
> The LIQUIDIO driver causing this problem is addressed in a
> separate patch, but this change is needed to prevent it from
> happening again.
> 
> Using "depends on DMADEVICES" is what we do for all other
> implementations of slave DMA controllers as well.
> 
> Fixes: b3c2fee5d66b ("crypto: ccp - Ensure all dependencies are specified")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/crypto/ccp/Kconfig | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt