- Update to 2.6.25-rc3.

[linux-flexiantxendom0-3.2.10.git] / drivers / char / hw_random / intel-rng.c

diff --git a/drivers/char/hw_random/intel-rng.c b/drivers/char/hw_random/intel-rng.c
index 753f460..5cc651e 100644 (file)
--- 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)