linux-kernel - [PATCH V2 2/5] hid-picolcd: replace snprintf in show functions with sysfs

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Message-Id: <1634296054-6971-3-git-send-email-wangqing@vivo.com>
Date:   Fri, 15 Oct 2021 04:07:29 -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 2/5] hid-picolcd: 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>
Acked-by: Bruno Prémont <bonbons@...ux-vserver.org>
---
 drivers/hid/hid-picolcd_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
index bbda231..fa46fb6 100644
--- a/drivers/hid/hid-picolcd_core.c
+++ b/drivers/hid/hid-picolcd_core.c
@@ -256,9 +256,9 @@ static ssize_t picolcd_operation_mode_show(struct device *dev,
 	struct picolcd_data *data = dev_get_drvdata(dev);
 
 	if (data->status & PICOLCD_BOOTLOADER)
-		return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
+		return sysfs_emit(buf, "[bootloader] lcd\n");
 	else
-		return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
+		return sysfs_emit(buf, "bootloader [lcd]\n");
 }
 
 static ssize_t picolcd_operation_mode_store(struct device *dev,
@@ -301,7 +301,7 @@ static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
 {
 	struct picolcd_data *data = dev_get_drvdata(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
+	return sysfs_emit(buf, "%hu\n", data->opmode_delay);
 }
 
 static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
-- 
2.7.4