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

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Date:   Thu, 14 Oct 2021 23:50:24 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] net: can: replace snprintf in show functions with sysfs_emit

show() must not use snprintf() when formatting the value to be
returned to user space.

Fix the following coccicheck warning:
drivers/net/can/at91_can.c:1185: WARNING: use scnprintf or sprintf.
drivers/net/can/janz-ican3.c:1834: 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/net/can/at91_can.c   | 4 ++--
 drivers/net/can/janz-ican3.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 04d0bb3..e4e754e 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -1182,9 +1182,9 @@ static ssize_t at91_sysfs_show_mb0_id(struct device *dev,
 	struct at91_priv *priv = netdev_priv(to_net_dev(dev));
 
 	if (priv->mb0_id & CAN_EFF_FLAG)
-		return snprintf(buf, PAGE_SIZE, "0x%08x\n", priv->mb0_id);
+		return sysfs_emit(buf, "0x%08x\n", priv->mb0_id);
 	else
-		return snprintf(buf, PAGE_SIZE, "0x%03x\n", priv->mb0_id);
+		return sysfs_emit(buf, "0x%03x\n", priv->mb0_id);
 }
 
 static ssize_t at91_sysfs_set_mb0_id(struct device *dev,
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 2a6c918..feedc13 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1831,7 +1831,7 @@ static ssize_t ican3_sysfs_show_term(struct device *dev,
 		return -ETIMEDOUT;
 	}
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", mod->termination_enabled);
+	return sysfs_emit(buf, "%u\n", mod->termination_enabled);
 }
 
 static ssize_t ican3_sysfs_set_term(struct device *dev,
-- 
2.7.4