From: Matt Mackall <mpm@selenic.com>

Reduce latency for large writes to /dev/[u]random

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Sami Farin <safari-kernel@safari.iki.fi>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/char/random.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN drivers/char/random.c~drivers-char-randomcwrite_pool-cond_resched-needed drivers/char/random.c
--- a/drivers/char/random.c~drivers-char-randomcwrite_pool-cond_resched-needed
+++ a/drivers/char/random.c
@@ -1041,6 +1041,7 @@ write_pool(struct entropy_store *r, cons
 		p += bytes;
 
 		add_entropy_words(r, buf, (bytes + 3) / 4);
+		cond_resched();
 	}
 
 	return 0;
_