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[HWRNG]: move status polling loop to data_present callbacks

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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>
This commit is contained in:
Patrick McHardy
2007-11-21 12:24:45 +08:00
committed by Herbert Xu
parent 2407d60872
commit 984e976f53
8 changed files with 71 additions and 36 deletions
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drivers/char/hw_random/intel-rng.c
+11 -2
View File
@@ -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;
int data, i;
return !!(readb(mem + INTEL_RNG_STATUS) & INTEL_RNG_DATA_PRESENT);
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)