linux-kernel - [PATCH] drbd: Fix test of unsigned in _drbd_fault

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Date:	Tue, 15 Dec 2009 22:55:44 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	drbd-dev@...ts.linbit.com, drbd-user@...ts.linbit.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] drbd: Fix test of unsigned in _drbd_fault_random()

rsp->count is unsigned so the test does not work.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
Found using coccinelle: http://coccinelle.lip6.fr/

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 157d1e4..c2594c1 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3623,7 +3623,7 @@ _drbd_fault_random(struct fault_random_state *rsp)
 {
 	long refresh;
 
-	if (--rsp->count < 0) {
+	if (!rsp->count--) {
 		get_random_bytes(&refresh, sizeof(refresh));
 		rsp->state += refresh;
 		rsp->count = FAULT_RANDOM_REFRESH;
--
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