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crypto: xilinx-trng - Fix return value of xtrng_hwrng_trng_read()

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Implementations of hwrng::read are expected to return the number of
bytes generated.  Update xtrng_hwrng_trng_read() to match that.

Fixes: 8979744aca ("crypto: xilinx - Add TRNG driver for Versal")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2026-05-31 12:17:36 -07:00
committed by Herbert Xu
parent 32b4d29280
commit 2dd6777422
1 changed files with 6 additions and 3 deletions
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9
drivers/crypto/xilinx/xilinx-trng.c
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@@ -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)