linux-kernel - [PATCH 06/21 v5] Input: atmel_mxt_ts - use scnprintf for object sysfs entry

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Date:	Tue, 26 Jun 2012 14:56:54 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Nick Dyer <nick.dyer@...ev.co.uk>, linux-input@...r.kernel.org
Cc:	Iiro Valkonen <iiro.valkonen@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	linux-kernel@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH 06/21 v5] Input: atmel_mxt_ts - use scnprintf for object sysfs entry

Using scnprintf() is a cleaner way to ensure that we don't overwrite the
PAGE_SIZE sysfs output buffer.

Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   16 ++++------------
 1 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9f8dd97..55855b8 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -904,17 +904,13 @@ static ssize_t mxt_object_show(struct device *dev,
 	for (i = 0; i < data->info.object_num; i++) {
 		object = data->object_table + i;
 
-		count += snprintf(buf + count, PAGE_SIZE - count,
+		count += scnprintf(buf + count, PAGE_SIZE - count,
 				"Object[%d] (Type %d)\n",
 				i + 1, object->type);
-		if (count >= PAGE_SIZE)
-			return PAGE_SIZE - 1;
 
 		if (!mxt_object_readable(object->type)) {
-			count += snprintf(buf + count, PAGE_SIZE - count,
+			count += scnprintf(buf + count, PAGE_SIZE - count,
 					"\n");
-			if (count >= PAGE_SIZE)
-				return PAGE_SIZE - 1;
 			continue;
 		}
 
@@ -924,15 +920,11 @@ static ssize_t mxt_object_show(struct device *dev,
 			if (error)
 				return error;
 
-			count += snprintf(buf + count, PAGE_SIZE - count,
+			count += scnprintf(buf + count, PAGE_SIZE - count,
 					"\t[%2d]: %02x (%d)\n", j, val, val);
-			if (count >= PAGE_SIZE)
-				return PAGE_SIZE - 1;
 		}
 
-		count += snprintf(buf + count, PAGE_SIZE - count, "\n");
-		if (count >= PAGE_SIZE)
-			return PAGE_SIZE - 1;
+		count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
 	}
 
 	return count;
-- 
1.7.7.3

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