diff options
| -rw-r--r-- | drivers/crypto/xilinx/xilinx-trng.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/crypto/xilinx/xilinx-trng.c b/drivers/crypto/xilinx/xilinx-trng.c index a35643baa489..a30b0b3b3685 100644 --- a/drivers/crypto/xilinx/xilinx-trng.c +++ b/drivers/crypto/xilinx/xilinx-trng.c @@ -239,18 +239,21 @@ static int xtrng_hwrng_trng_read(struct hwrng *hwrng, void *data, size_t max, bo { u8 buf[TRNG_SEC_STRENGTH_BYTES]; struct xilinx_rng *rng; - int ret = -EINVAL, i = 0; + int ret = 0, i = 0; rng = container_of(hwrng, struct xilinx_rng, trng); while (i < max) { ret = xtrng_random_bytes_generate(rng, buf, TRNG_SEC_STRENGTH_BYTES, wait); - if (ret < 0) + if (ret < 0) { + if (i == 0) + return ret; break; + } memcpy(data + i, buf, min_t(int, ret, (max - i))); i += min_t(int, ret, (max - i)); } - return ret; + return i; } static int xtrng_hwrng_register(struct hwrng *trng) |