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hwrng: arm-smccc-trng - fix NO_ENTROPY handling

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The SMCCC_RET_TRNG_NO_ENTROPY switch arm is never used because the
NO_ENTROPY return value is negative and negative values are handled
above the switch by immediately returning.

Fix by handling errors using a default arm in the switch.

Fixes: 0888d04b47 ("hwrng: Add Arm SMCCC TRNG based driver")
Signed-off-by: James Cowgill <james.cowgill@blaize.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
James Cowgill 2022-08-01 20:04:18 +00:00 committed by Herbert Xu
parent 882aa6525c
commit 042b4b169c
1 changed files with 2 additions and 2 deletions
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4
drivers/char/hw_random/arm_smccc_trng.c
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@ -71,8 +71,6 @@ static int smccc_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
MAX_BITS_PER_CALL);
arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_RND, bits, &res);
if ((int)res.a0 < 0)
return (int)res.a0;
switch ((int)res.a0) {
case SMCCC_RET_SUCCESS:
@ -88,6 +86,8 @@ static int smccc_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
return copied;
cond_resched();
break;
default:
return -EIO;
}
}