X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=lib%2Frandom32.c;h=61489677870007e273301209438ac4913562b140;hb=HEAD;hp=1e5b2df442916de82ef497f844c068724f8cd555;hpb=b8aba7611b9a5a1f67f081be84270c67baf4d2c3;p=~andy%2Flinux

diff --git a/lib/random32.c b/lib/random32.c
index 1e5b2df4429..61489677870 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -244,8 +244,19 @@ static void __prandom_reseed(bool late)
 	static bool latch = false;
 	static DEFINE_SPINLOCK(lock);
 
+	/* Asking for random bytes might result in bytes getting
+	 * moved into the nonblocking pool and thus marking it
+	 * as initialized. In this case we would double back into
+	 * this function and attempt to do a late reseed.
+	 * Ignore the pointless attempt to reseed again if we're
+	 * already waiting for bytes when the nonblocking pool
+	 * got initialized.
+	 */
+
 	/* only allow initial seeding (late == false) once */
-	spin_lock_irqsave(&lock, flags);
+	if (!spin_trylock_irqsave(&lock, flags))
+		return;
+
 	if (latch && !late)
 		goto out;
 	latch = true;