From: Matt Mackall <mpm@selenic.com>
Date: Wed, 6 Feb 2008 09:37:20 +0000 (-0800)
Subject: drivers/char/random.c:write_pool() cond_resched() needed
X-Git-Tag: v2.6.25-rc1~709
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91f3f1e304f2e9ff2c8b9c76efd4fb8ff93110f7;p=linux-2.6

drivers/char/random.c:write_pool() cond_resched() needed

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/char/random.c b/drivers/char/random.c
index c511a831f0..f43c89f7c4 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1039,6 +1039,7 @@ write_pool(struct entropy_store *r, const char __user *buffer, size_t count)
 		p += bytes;
 
 		add_entropy_words(r, buf, (bytes + 3) / 4);
+		cond_resched();
 	}
 
 	return 0;