linux-kernel - [PATCH] comedi: replace snprintf in show functions with sysfs

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Date:   Tue, 12 Oct 2021 20:26:27 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] comedi: replace snprintf in show functions with sysfs_emit

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the following coccicheck warning:
drivers/comedi/comedi_fops.c:399:8-16: WARNING: use scnprintf or sprintf.
drivers/comedi/comedi_fops.c:455:8-16: WARNING: use scnprintf or sprintf.
drivers/comedi/comedi_fops.c:512:8-16: WARNING: use scnprintf or sprintf.
drivers/comedi/comedi_fops.c:568:8-16: WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/comedi/comedi_fops.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c
index df77b6b..3d90029 100644
--- a/drivers/comedi/comedi_fops.c
+++ b/drivers/comedi/comedi_fops.c
@@ -396,7 +396,7 @@ static ssize_t max_read_buffer_kb_show(struct device *csdev,
 	mutex_unlock(&dev->mutex);
 
 	comedi_dev_put(dev);
-	return snprintf(buf, PAGE_SIZE, "%u\n", size);
+	return sysfs_emit(buf, "%u\n", size);
 }
 
 static ssize_t max_read_buffer_kb_store(struct device *csdev,
@@ -452,7 +452,7 @@ static ssize_t read_buffer_kb_show(struct device *csdev,
 	mutex_unlock(&dev->mutex);
 
 	comedi_dev_put(dev);
-	return snprintf(buf, PAGE_SIZE, "%u\n", size);
+	return sysfs_emit(buf, "%u\n", size);
 }
 
 static ssize_t read_buffer_kb_store(struct device *csdev,
@@ -509,7 +509,7 @@ static ssize_t max_write_buffer_kb_show(struct device *csdev,
 	mutex_unlock(&dev->mutex);
 
 	comedi_dev_put(dev);
-	return snprintf(buf, PAGE_SIZE, "%u\n", size);
+	return sysfs_emit(buf, "%u\n", size);
 }
 
 static ssize_t max_write_buffer_kb_store(struct device *csdev,
@@ -565,7 +565,7 @@ static ssize_t write_buffer_kb_show(struct device *csdev,
 	mutex_unlock(&dev->mutex);
 
 	comedi_dev_put(dev);
-	return snprintf(buf, PAGE_SIZE, "%u\n", size);
+	return sysfs_emit(buf, "%u\n", size);
 }
 
 static ssize_t write_buffer_kb_store(struct device *csdev,
-- 
2.7.4