linux-kernel - [PATCH v3] staging: fieldbus: use sysfs

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Date:   Wed, 9 Nov 2022 16:12:43 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     outreachy@...ts.linux.dev, Sven Van Asbroeck <TheSven73@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v3] staging: fieldbus: use sysfs_emit() in show functions

The show() methods should only use sysfs_emit() when formatting values
to be returned to the user space.
Ref: Documentation/filesystems/sysfs.rst
Issue identified by coccicheck.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
Changes in v3:
   1. Include other show functions from the same file in the scope of this
      patch. Feedback from gregkh@...uxfoundation.org
   2. Simplify code comment.

Changes in v2:
   1. Switch to using sysfs_emit instead of scnprintf
   2. Update patch subject and log accordingly
      Feedback from gregkh@...uxfoundation.org


 drivers/staging/fieldbus/dev_core.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/fieldbus/dev_core.c b/drivers/staging/fieldbus/dev_core.c
index 5aab734606ea..5f54f2674bd1 100644
--- a/drivers/staging/fieldbus/dev_core.c
+++ b/drivers/staging/fieldbus/dev_core.c
@@ -28,7 +28,7 @@ static ssize_t online_show(struct device *dev, struct device_attribute *attr,
 {
 	struct fieldbus_dev *fb = dev_get_drvdata(dev);

-	return sprintf(buf, "%d\n", !!fb->online);
+	return sysfs_emit(buf, "%d\n", !!fb->online);
 }
 static DEVICE_ATTR_RO(online);

@@ -39,7 +39,7 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,

 	if (!fb->enable_get)
 		return -EINVAL;
-	return sprintf(buf, "%d\n", !!fb->enable_get(fb));
+	return sysfs_emit(buf, "%d\n", !!fb->enable_get(fb));
 }

 static ssize_t enabled_store(struct device *dev, struct device_attribute *attr,
@@ -66,11 +66,8 @@ static ssize_t card_name_show(struct device *dev, struct device_attribute *attr,
 {
 	struct fieldbus_dev *fb = dev_get_drvdata(dev);

-	/*
-	 * card_name was provided by child driver, could potentially be long.
-	 * protect against buffer overrun.
-	 */
-	return snprintf(buf, PAGE_SIZE, "%s\n", fb->card_name);
+	/* card_name was provided by child driver. */
+	return sysfs_emit(buf, "%s\n", fb->card_name);
 }
 static DEVICE_ATTR_RO(card_name);

@@ -79,7 +76,7 @@ static ssize_t read_area_size_show(struct device *dev,
 {
 	struct fieldbus_dev *fb = dev_get_drvdata(dev);

-	return sprintf(buf, "%zu\n", fb->read_area_sz);
+	return sysfs_emit(buf, "%zu\n", fb->read_area_sz);
 }
 static DEVICE_ATTR_RO(read_area_size);

@@ -88,7 +85,7 @@ static ssize_t write_area_size_show(struct device *dev,
 {
 	struct fieldbus_dev *fb = dev_get_drvdata(dev);

-	return sprintf(buf, "%zu\n", fb->write_area_sz);
+	return sysfs_emit(buf, "%zu\n", fb->write_area_sz);
 }
 static DEVICE_ATTR_RO(write_area_size);

@@ -116,7 +113,7 @@ static ssize_t fieldbus_type_show(struct device *dev,
 		break;
 	}

-	return sprintf(buf, "%s\n", t);
+	return sysfs_emit(buf, "%s\n", t);
 }
 static DEVICE_ATTR_RO(fieldbus_type);

--
2.34.1