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hwrng: npcm - modify readl to readb

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Modify the read size to the correct HW random
registers size, 8bit.
The incorrect read size caused and faulty
HW random value.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tomer Maimon 2020-09-24 00:23:05 +03:00 committed by Herbert Xu
parent 00c9211f60
commit c2fb644638
1 changed files with 7 additions and 7 deletions
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14
drivers/char/hw_random/npcm-rng.c
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@ -58,24 +58,24 @@ static int npcm_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
pm_runtime_get_sync((struct device *)priv->rng.priv);
while (max >= sizeof(u32)) {
while (max) {
if (wait) {
if (readl_poll_timeout(priv->base + NPCM_RNGCS_REG,
if (readb_poll_timeout(priv->base + NPCM_RNGCS_REG,
ready,
ready & NPCM_RNG_DATA_VALID,
NPCM_RNG_POLL_USEC,
NPCM_RNG_TIMEOUT_USEC))
break;
} else {
if ((readl(priv->base + NPCM_RNGCS_REG) &
if ((readb(priv->base + NPCM_RNGCS_REG) &
NPCM_RNG_DATA_VALID) == 0)
break;
}
*(u32 *)buf = readl(priv->base + NPCM_RNGD_REG);
retval += sizeof(u32);
buf += sizeof(u32);
max -= sizeof(u32);
*(u8 *)buf = readb(priv->base + NPCM_RNGD_REG);
retval++;
buf++;
max--;
}
pm_runtime_mark_last_busy((struct device *)priv->rng.priv);