From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 21 May 2015 08:19:54 +0000 (+0800)
Subject: random: Wake up all getrandom(2) callers when pool is ready
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1d9de44e268d880cbe2d0bd3be1ef0661f93fd34;p=openwrt%2Fstaging%2Fblogic.git

random: Wake up all getrandom(2) callers when pool is ready

If more than one application invokes getrandom(2) before the pool
is ready, then all bar one will be stuck forever because we use
wake_up_interruptible which wakes up a single task.

This patch replaces it with wake_up_all.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 9cd6968e2f92..8b8c46b5fd5c 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -660,7 +660,7 @@ retry:
 		r->entropy_total = 0;
 		if (r == &nonblocking_pool) {
 			prandom_reseed_late();
-			wake_up_interruptible(&urandom_init_wait);
+			wake_up_all(&urandom_init_wait);
 			pr_notice("random: %s pool is initialized\n", r->name);
 		}
 	}