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hwrng: bcm2835 - Read as much data as available 

Read the requested number of data from the fifo

Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Yendapally Reddy Dhananjaya Reddy 2016-05-27 06:10:41 -04:00 committed by Herbert Xu
parent 33a36a5bc0
commit 4f8de65bab
1 changed files with 10 additions and 2 deletions
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12
drivers/char/hw_random/bcm2835-rng.c
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@ -43,6 +43,8 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
bool wait)
{
void __iomem *rng_base = (void __iomem *)rng->priv;
u32 max_words = max / sizeof(u32);
u32 num_words, count;
while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) {
if (!wait)
@ -50,8 +52,14 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
cpu_relax();
}
*(u32 *)buf = __raw_readl(rng_base + RNG_DATA);
return sizeof(u32);
num_words = readl(rng_base + RNG_STATUS) >> 24;
if (num_words > max_words)
num_words = max_words;
for (count = 0; count < num_words; count++)
((u32 *)buf)[count] = readl(rng_base + RNG_DATA);
return num_words * sizeof(u32);
}
static struct hwrng bcm2835_rng_ops = {