linux-kernel - [PATCH 14/35] W1: w1_slave_read

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Message-ID: <20080328122556.GO3613@spacedout.fries.net>
Date:	Fri, 28 Mar 2008 07:25:56 -0500
From:	David Fries <david@...es.net>
To:	linux-kernel@...r.kernel.org
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>
Subject: [PATCH 14/35] W1: w1_slave_read_id multiple short read bug

This is more to point out the bug in w1_slave_read_id, the next patch
rewrites the routine.

w1.c 1.15
Reading at an offset other than zero, ie reading less than 8 bytes at
a time would result in reading the first bytes over and over until 8
bytes were returned.  Added the offset to the buffer.

Signed-off-by: David Fries <david@...es.net>
---
 drivers/w1/w1.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index b18eedb..dbd9930 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -110,13 +110,13 @@ static ssize_t w1_slave_read_id(struct kobject *kobj,
 {
 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
 
-	if (off > 8) {
+	if (off >= 8) {
 		count = 0;
 	} else {
 		if (off + count > 8)
 			count = 8 - off;
 
-		memcpy(buf, (u8 *)&sl->reg_num, count);
+		memcpy(buf, (u8 *)&sl->reg_num+off, count);
 	}
 
 	return count;
-- 
1.4.4.4

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