randconfig testing found this (post-v2.6.24) build bug:
 drivers/built-in.o: In function `hifn_unregister_rng':

 hifn_795x.c:(.text+0x17bbd9): undefined reference to `hwrng_unregister'

 drivers/built-in.o: In function `hifn_probe':

 hifn_795x.c:(.text+0x17df70): undefined reference to `hwrng_register'
config attached.
i tried to reply to the pull request on lkml, but was unable to find

one. The bug came in via:
    Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
    * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (125 commits)
	Ingo

find a workaround below - but i'm not sure it's the right one.
	Ingo
Index: linux/drivers/crypto/Kconfig

===================================================================

--- linux.orig/drivers/crypto/Kconfig

+++ linux/drivers/crypto/Kconfig

@@ -89,6 +89,7 @@ config CRYPTO_DEV_HIFN_795X

 	select CRYPTO_ALGAPI

 	select CRYPTO_BLKCIPHER

 	depends on PCI

+	depends on DEV_HIFN_795X = HW_RANDOM

 	help

 	  This option allows you to have support for HIFN 795x crypto adapters.
--

Thanks, but I've already checked in a fix :)

--

Visit Openswan at http://www.openswan.org/

Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>

Home Page: http://gondor.apana.org.au/~herbert/

PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

--

hey, that's my punishment for not reading my email promptly :) Could

have saved me some time in the Kconfig web of dependencies :-/
	Ingo

--

I'll fix it with the following patch.
Cheers,

--

Visit Openswan at http://www.openswan.org/

Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>

Home Page: http://gondor.apana.org.au/~herbert/

PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

--

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig

index 74bd599..8a70a9e 100644

--- a/drivers/crypto/Kconfig

+++ b/drivers/crypto/Kconfig

@@ -88,10 +88,16 @@ config CRYPTO_DEV_HIFN_795X

 	select CRYPTO_DES

 	select CRYPTO_ALGAPI

 	select CRYPTO_BLKCIPHER

+	select HW_RANDOM if CRYPTO_DEV_HIFN_795X_RNG

 	depends on PCI

 	help

 	  This option allows you to have support for HIFN 795x crypto adapters.
-

+config CRYPTO_DEV_HIFN_795X_RNG

+	bool "HIFN 795x random number generator"

+	depends on CRYPTO_DEV_HIFN_795X

+	help

+	  Select this option if you want to enable the random number generator

+	  on the HIFN 795x crypto adapters.
 endif # CRYPTO_HW

diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c

index 16413e5..dfbf24c 100644

--- a/drivers/crypto/hifn_795x.c

+++ b/drivers/crypto/hifn_795x.c

@@ -463,7 +463,7 @@ struct hifn_device
 	unsigned int		pk_clk_freq;
-#if defined(CONFIG_HW_RANDOM) || defined(CONFIG_HW_RANDOM_MODULE)

+#ifdef CRYPTO_DEV_HIFN_795X_RNG

 	unsigned int		rng_wait_time;

 	ktime_t			rngtime;

 	struct hwrng		rng;

@@ -795,7 +795,7 @@ static struct pci2id {

 	}

 };
-#if defined(CONFIG_HW_RANDOM) || defined(CONFIG_HW_RANDOM_MODULE)

+#ifdef CRYPTO_DEV_HIFN_795X_RNG

 static int hifn_rng_data_present(struct hwrng *rng, int wait)

 {

 	struct hifn_device *dev = (struct hifn_device *)rng->priv;

@@ -880,7 +880,7 @@ static int hifn_init_pubrng(struct hifn_device *dev)

 	dprintk("Chip %s: RNG engine has been successfully initialised.\n",

 			dev->name);
-#if defined(CONFIG_HW_RANDOM) || defined(CONFIG_HW_RANDOM_MODULE)

+#ifdef CRYPTO_DEV_HIFN_795X_RNG

 	/* First value must be discarded */

 	hifn_read_1(dev, HIFN_1_RNG_DATA);

 	dev->rngtime ...
[ message continues ]

Hi.
Thanks for fixing that up, if people who do not like select will

complain, we can make hifn rng depend on hw_random.
--

	Evgeniy Polyakov

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