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/intel-rng.c | |
| parent | 2407d60872dd2a95404c6048f775f3b64d438f4b (diff) | |
[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/intel-rng.c')
| -rw-r--r-- | drivers/char/hw_random/intel-rng.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/char/hw_random/intel-rng.c b/drivers/char/hw_random/intel-rng.c index 753f46052b87..5cc651ef75eb 100644 --- a/drivers/char/hw_random/intel-rng.c +++ b/drivers/char/hw_random/intel-rng.c @@ -29,6 +29,7 @@ #include <linux/module.h> #include <linux/pci.h> #include <linux/stop_machine.h> +#include <linux/delay.h> #include <asm/io.h> @@ -162,11 +163,19 @@ static inline u8 hwstatus_set(void __iomem *mem, return hwstatus_get(mem); } -static int intel_rng_data_present(struct hwrng *rng) +static int intel_rng_data_present(struct hwrng *rng, int wait) { void __iomem *mem = (void __iomem *)rng->priv; - - return !!(readb(mem + INTEL_RNG_STATUS) & INTEL_RNG_DATA_PRESENT); + int data, i; + + for (i = 0; i < 20; i++) { + data = !!(readb(mem + INTEL_RNG_STATUS) & + INTEL_RNG_DATA_PRESENT); + if (data || !wait) + break; + udelay(10); + } + return data; } static int intel_rng_data_read(struct hwrng *rng, u32 *data) |