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crypto: caam - double the entropy delay interval for retry

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[ Upstream commit 9048beca9c5614d486e2b492c0a7867164bf56a8 ]

during entropy evaluation, if the generated samples fail
any statistical test, then, all of the bits will be discarded,
and a second set of samples will be generated and tested.

the entropy delay interval should be doubled before performing the
retry.

also, ctrlpriv->rng4_sh_init and inst_handles both reads RNG DRNG
status register, but only inst_handles is updated before every retry.
so only check inst_handles and removing ctrlpriv->rng4_sh_init

Signed-off-by: Gaurav Jain <gaurav.jain@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gaurav Jain
2025-09-05 15:41:48 +05:30
committed by Greg Kroah-Hartman
parent 01be9fad74
commit 160b03e57e
1 changed files with 2 additions and 2 deletions
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4
drivers/crypto/caam/ctrl.c
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@@ -692,12 +692,12 @@ static int caam_ctrl_rng_init(struct device *dev)
*/
if (needs_entropy_delay_adjustment())
ent_delay = 12000;
if (!(ctrlpriv->rng4_sh_init || inst_handles)) {
if (!inst_handles) {
dev_info(dev,
"Entropy delay = %u\n",
ent_delay);
kick_trng(dev, ent_delay);
ent_delay += 400;
ent_delay = ent_delay * 2;
}
/*
* if instantiate_rng(...) fails, the loop will rerun