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| author | PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> | 2016-11-18 23:00:10 +0530 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-11-21 22:50:45 +0800 |
| commit | ed424bb3680b6e6167a44c5c195ec8f9aea3ab3b (patch) | |
| tree | 11b446c82310aad649ff7888d479dbbdc5cd2a63 /drivers/char | |
| parent | 8ff4c191d1123ea1ba610dbc25e93568d9e7756c (diff) | |
| download | linux-next-ed424bb3680b6e6167a44c5c195ec8f9aea3ab3b.tar.gz | |
hwrng: Make explicit that max >= 32 always
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/msm-rng.c | 4 | ||||
| -rw-r--r-- | drivers/char/hw_random/pic32-rng.c | 3 | ||||
| -rw-r--r-- | drivers/char/hw_random/pseries-rng.c | 5 |
3 files changed, 2 insertions, 10 deletions
diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c index 96fb986402eb..841fee845ec9 100644 --- a/drivers/char/hw_random/msm-rng.c +++ b/drivers/char/hw_random/msm-rng.c @@ -90,10 +90,6 @@ static int msm_rng_read(struct hwrng *hwrng, void *data, size_t max, bool wait) /* calculate max size bytes to transfer back to caller */ maxsize = min_t(size_t, MAX_HW_FIFO_SIZE, max); - /* no room for word data */ - if (maxsize < WORD_SZ) - return 0; - ret = clk_prepare_enable(rng->clk); if (ret) return ret; diff --git a/drivers/char/hw_random/pic32-rng.c b/drivers/char/hw_random/pic32-rng.c index 11dc9b7c09ce..9b5e68a71d01 100644 --- a/drivers/char/hw_random/pic32-rng.c +++ b/drivers/char/hw_random/pic32-rng.c @@ -62,9 +62,6 @@ static int pic32_rng_read(struct hwrng *rng, void *buf, size_t max, u32 t; unsigned int timeout = RNG_TIMEOUT; - if (max < 8) - return 0; - do { t = readl(priv->base + RNGRCNT) & RCNT_MASK; if (t == 64) { diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c index 63ce51d09af1..d9f46b437cc2 100644 --- a/drivers/char/hw_random/pseries-rng.c +++ b/drivers/char/hw_random/pseries-rng.c @@ -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; } /** |