[PATCH 6/7] lib/random32.c: Randomize timeout to the millisecond, not the second

[George Spelvin]

If you're going to bother randomizing it, do it right.
And use prandom_u32_max(), which is designed for the job, rather
than "% 40".

Signed-off-by: George Spelvin <linux@xxxxxxxxxxx>
---
 lib/random32.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/random32.c b/lib/random32.c
index eee60100..9cc410dd 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -208,14 +208,14 @@ static DEFINE_TIMER(seed_timer, __prandom_timer, 0, 0);
 static void __prandom_timer(unsigned long dontcare)
 {
 	u32 entropy;
-	unsigned long expires;
+	unsigned int expires;
 
 	get_random_bytes(&entropy, sizeof(entropy));
 	prandom_seed(entropy);
 
 	/* reseed every ~60 seconds, in [40 .. 80) interval with slack */
-	expires = 40 + (prandom_u32() % 40);
-	seed_timer.expires = jiffies + msecs_to_jiffies(expires * MSEC_PER_SEC);
+	expires = 40000 + prandom_u32_max(40000);
+	seed_timer.expires = jiffies + msecs_to_jiffies(expires);
 
 	add_timer(&seed_timer);
 }
-- 
2.0.0

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