From 1865a9c382ede507065cf1575308b53495814c7d Mon Sep 17 00:00:00 2001
From: Kulikov Vasiliy <segooon@gmail.com>
Date: Sat, 31 Jul 2010 21:40:07 +0400
Subject: USB: adutux: fix misuse of return value of copy_to_user()

copy_to_user() returns number of not copied bytes, not error code.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index d240de0..801324a 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -439,7 +439,7 @@ static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
 			/* drain secondary buffer */
 			int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
 			i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
-			if (i < 0) {
+			if (i) {
 				retval = -EFAULT;
 				goto exit;
 			}
-- 
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