Hardware random number quality is measured from 0 (no entropy) to 1024
(perfect entropy). Allow hardware devices to assert the full range by
truncating the device-provided value at 1024 instead of 1023.
Signed-off-by: Keith Packard <kei...@keithp.com>
---
drivers/char/hw_random/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 1500cfd..b726683 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -98,7 +98,8 @@ static inline int hwrng_init(struct hwrng *rng)
add_early_randomness(rng);
current_quality = rng->quality ? : default_quality;
- current_quality &= 1023;
+ if (current_quality > 1024)
+ current_quality = 1024;
if (current_quality == 0 && hwrng_fill)
kthread_stop(hwrng_fill);
--
2.1.4
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