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| author | James Cowgill <james.cowgill@blaize.com> | 2022-08-01 20:04:18 +0000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-08-19 18:39:35 +0800 |
| commit | 042b4b169c6fb9d4df268d66282d7302dd73d37b (patch) | |
| tree | 8d722cdcb291c74c40822f008b6a7ad1de73ba4b /drivers | |
| parent | 882aa6525cabcfa0cea61e1a19c9af4c543118ac (diff) | |
| download | linux-stable-042b4b169c6fb9d4df268d66282d7302dd73d37b.tar.gz linux-stable-042b4b169c6fb9d4df268d66282d7302dd73d37b.tar.bz2 linux-stable-042b4b169c6fb9d4df268d66282d7302dd73d37b.zip | |
hwrng: arm-smccc-trng - fix NO_ENTROPY handling
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: 0888d04b47a1 ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/hw_random/arm_smccc_trng.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/hw_random/arm_smccc_trng.c b/drivers/char/hw_random/arm_smccc_trng.c index b24ac39a903b..e34c3ea692b6 100644 --- a/drivers/char/hw_random/arm_smccc_trng.c +++ b/drivers/char/hw_random/arm_smccc_trng.c @@ -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; } } |