linux-kernel - [PATCH V2 1/5] hid-lenovo: replace snprintf in show functions with sysfs

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Date:   Fri, 15 Oct 2021 04:07:28 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bruno Prémont <bonbons@...ux-vserver.org>,
        Stefan Achatz <erazor_de@...rs.sourceforge.net>,
        Jonathan Cameron <jic23@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH V2 1/5] hid-lenovo: replace snprintf in show functions with sysfs_emit

show() should not use snprintf() when formatting the value to be returned 
to user space, snprintf() returns the length the resulting string and 
scnprintf() returns the number of bytes printed into the buffer.

Fix the coccicheck warnings:
WARNING: use scnprintf or sprintf.

Use sysfs_emit() instead of scnprintf() makes more sense.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/hid/hid-lenovo.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 93b1f93..086a7ae 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -400,7 +400,7 @@ static ssize_t attr_fn_lock_show(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data->fn_lock);
+	return sysfs_emit(buf, "%u\n", data->fn_lock);
 }
 
 static ssize_t attr_fn_lock_store(struct device *dev,
@@ -442,7 +442,7 @@ static ssize_t attr_sensitivity_show_cptkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
+	return sysfs_emit(buf, "%u\n",
 		cptkbd_data->sensitivity);
 }
 
@@ -603,7 +603,7 @@ static ssize_t attr_press_to_select_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->press_to_select);
+	return sysfs_emit(buf, "%u\n", data_pointer->press_to_select);
 }
 
 static ssize_t attr_press_to_select_store_tpkbd(struct device *dev,
@@ -633,7 +633,7 @@ static ssize_t attr_dragging_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->dragging);
+	return sysfs_emit(buf, "%u\n", data_pointer->dragging);
 }
 
 static ssize_t attr_dragging_store_tpkbd(struct device *dev,
@@ -663,7 +663,7 @@ static ssize_t attr_release_to_select_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->release_to_select);
+	return sysfs_emit(buf, "%u\n", data_pointer->release_to_select);
 }
 
 static ssize_t attr_release_to_select_store_tpkbd(struct device *dev,
@@ -693,7 +693,7 @@ static ssize_t attr_select_right_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", data_pointer->select_right);
+	return sysfs_emit(buf, "%u\n", data_pointer->select_right);
 }
 
 static ssize_t attr_select_right_store_tpkbd(struct device *dev,
@@ -723,7 +723,7 @@ static ssize_t attr_sensitivity_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
+	return sysfs_emit(buf, "%u\n",
 		data_pointer->sensitivity);
 }
 
@@ -752,7 +752,7 @@ static ssize_t attr_press_speed_show_tpkbd(struct device *dev,
 	struct hid_device *hdev = to_hid_device(dev);
 	struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n",
+	return sysfs_emit(buf, "%u\n",
 		data_pointer->press_speed);
 }
 
-- 
2.7.4