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[CRYPTO] hifn795x: Disallow built-in hifn795x when HW_RANDOM is m 

Currently it is possible to select HW_RANDOM as a module and have
hifn795x built-in.  This causes a build problem because hifn795x
will then call hwrng_register which isn't built-in.

This patch introduces a new config option to control the hifn795x
RNG which lets us avoid this problem.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2008-01-26 09:48:44 +11:00
parent 2d94dfc8c3
commit 946fef4e14
2 changed files with 10 additions and 4 deletions
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8
drivers/crypto/Kconfig
View File

@ -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

6
drivers/crypto/hifn_795x.c
View File

@ -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 = ktime_get();