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hwrng: Make explicit that max >= 32 always

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As hw_random core calls ->read with max > 32 or more, make it explicit.
Also remove checks involving 'max' being less than 8.

Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
PrasannaKumar Muralidharan
2016-11-18 23:00:10 +05:30
committed by Herbert Xu
parent 8ff4c191d1
commit ed424bb368
4 changed files with 3 additions and 12 deletions
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5
drivers/char/hw_random/pseries-rng.c
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@@ -28,7 +28,6 @@
static int pseries_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
u64 buffer[PLPAR_HCALL_BUFSIZE];
size_t size = max < 8 ? max : 8;
int rc;
rc = plpar_hcall(H_RANDOM, (unsigned long *)buffer);
@@ -36,10 +35,10 @@ static int pseries_rng_read(struct hwrng *rng, void *data, size_t max, bool wait
pr_err_ratelimited("H_RANDOM call failed %d\n", rc);
return -EIO;
}
memcpy(data, buffer, size);
memcpy(data, buffer, 8);
/* The hypervisor interface returns 64 bits */
return size;
return 8;
}
/**