diff options
| author |   Patrick McHardy <kaber@trash.net> | 2007-11-21 12:24:45 +0800 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2008-01-11 08:16:16 +1100 |
| commit | 984e976f5382ff09351ddd3b023937611396d739 (patch) | |
| tree | 2fcce0de19b06547772f015b8409efc3d2c8d52a /drivers/char/hw_random/core.c | |
| parent | [CRYPTO] salsa20: Salsa20 stream cipher (diff) | |
| download | linux-dev-984e976f5382ff09351ddd3b023937611396d739.tar.xz linux-dev-984e976f5382ff09351ddd3b023937611396d739.zip | |
[HWRNG]: move status polling loop to data_present callbacks
Handle waiting for new random within the drivers themselves, this allows to
use better suited timeouts for the individual rngs.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random/core.c')
| -rw-r--r-- | drivers/char/hw_random/core.c | 24 |
1 files changed, 6 insertions, 18 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 26a860adcb38..0118b9817a95 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -66,11 +66,11 @@ static inline void hwrng_cleanup(struct hwrng *rng) rng->cleanup(rng); } -static inline int hwrng_data_present(struct hwrng *rng) +static inline int hwrng_data_present(struct hwrng *rng, int wait) { if (!rng->data_present) return 1; - return rng->data_present(rng); + return rng->data_present(rng, wait); } static inline int hwrng_data_read(struct hwrng *rng, u32 *data) @@ -94,8 +94,7 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf, { u32 data; ssize_t ret = 0; - int i, err = 0; - int data_present; + int err = 0; int bytes_read; while (size) { @@ -107,21 +106,10 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf, err = -ENODEV; goto out; } - if (filp->f_flags & O_NONBLOCK) { - data_present = hwrng_data_present(current_rng); - } else { - /* Some RNG require some time between data_reads to gather - * new entropy. Poll it. - */ - for (i = 0; i < 20; i++) { - data_present = hwrng_data_present(current_rng); - if (data_present) - break; - udelay(10); - } - } + bytes_read = 0; - if (data_present) + if (hwrng_data_present(current_rng, + !(filp->f_flags & O_NONBLOCK))) bytes_read = hwrng_data_read(current_rng, &data); mutex_unlock(&rng_mutex); |