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| author | Tomer Maimon <tmaimon77@gmail.com> | 2020-09-24 00:23:05 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-10-02 18:02:13 +1000 |
| commit | c2fb644638ae45cc4a34aa51a18d687d4781f8a1 (patch) | |
| tree | 65941b2c6a04a0e11e1490793554bbb275fbb82a /drivers/char | |
| parent | 00c9211f60db2dead16856f81a3e6ab86b31f275 (diff) | |
| download | linux-c2fb644638ae45cc4a34aa51a18d687d4781f8a1.tar.gz | |
hwrng: npcm - modify readl to readb
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/npcm-rng.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/char/hw_random/npcm-rng.c b/drivers/char/hw_random/npcm-rng.c index 5d0d13f891b7..1ec5f267a656 100644 --- a/drivers/char/hw_random/npcm-rng.c +++ b/drivers/char/hw_random/npcm-rng.c @@ -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); |