linux-kernel - [PATCH v2 2/9] pktcdvd: replace sscanf() by kstrtoul()

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Date:   Fri, 10 Mar 2023 18:45:42 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/9] pktcdvd: replace sscanf() by kstrtoul()

The checkpatch.pl warns: "Prefer kstrto<type> to single variable sscanf".
Fix the code accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/block/pktcdvd.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 0ec8dc8ee5ed..ad4336ae9927 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -236,15 +236,16 @@ static ssize_t congestion_off_store(struct device *dev,
 				    const char *buf, size_t len)
 {
 	struct pktcdvd_device *pd = dev_get_drvdata(dev);
-	int val;
+	int val, ret;
 
-	if (sscanf(buf, "%d", &val) == 1) {
-		spin_lock(&pd->lock);
-		pd->write_congestion_off = val;
-		init_write_congestion_marks(&pd->write_congestion_off,
-					&pd->write_congestion_on);
-		spin_unlock(&pd->lock);
-	}
+	ret = kstrtoint(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	spin_lock(&pd->lock);
+	pd->write_congestion_off = val;
+	init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
+	spin_unlock(&pd->lock);
 	return len;
 }
 static DEVICE_ATTR_RW(congestion_off);
@@ -266,15 +267,16 @@ static ssize_t congestion_on_store(struct device *dev,
 				   const char *buf, size_t len)
 {
 	struct pktcdvd_device *pd = dev_get_drvdata(dev);
-	int val;
+	int val, ret;
 
-	if (sscanf(buf, "%d", &val) == 1) {
-		spin_lock(&pd->lock);
-		pd->write_congestion_on = val;
-		init_write_congestion_marks(&pd->write_congestion_off,
-					&pd->write_congestion_on);
-		spin_unlock(&pd->lock);
-	}
+	ret = kstrtoint(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	spin_lock(&pd->lock);
+	pd->write_congestion_on = val;
+	init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on);
+	spin_unlock(&pd->lock);
 	return len;
 }
 static DEVICE_ATTR_RW(congestion_on);
-- 
2.39.1