Commit 9048beca authored by Gaurav Jain's avatar Gaurav Jain Committed by Herbert Xu
Browse files

crypto: caam - double the entropy delay interval for retry 



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: default avatarGaurav Jain <gaurav.jain@nxp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4fcd3229

drivers/crypto/caam/ctrl.c

+2 −2
Original line number Diff line number Diff line
@@ -703,12 +703,12 @@ 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