linux-kernel - [PATCH] hamradio: Delete unnecessary checks before the macro call “dev_kfree

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Message-ID: <61fc7b82-dbc0-93e4-bf43-9856eb4c6688@web.de>
Date:   Wed, 21 Aug 2019 22:00:16 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     linux-hams@...r.kernel.org, netdev@...r.kernel.org,
        Allison Randal <allison@...utok.net>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Sailer <t.sailer@...mni.ethz.ch>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] hamradio: Delete unnecessary checks before the macro call “dev_kfree_skb”

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 21 Aug 2019 21:48:46 +0200

The dev_kfree_skb() function performs also input parameter validation.
Thus the test around the shown calls is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/net/hamradio/baycom_epp.c | 3 +--
 drivers/net/hamradio/hdlcdrv.c    | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 9303aeb2595f..4476491b58f9 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -961,8 +961,7 @@ static int epp_close(struct net_device *dev)
 	parport_write_control(pp, 0); /* reset the adapter */
         parport_release(bc->pdev);
         parport_unregister_device(bc->pdev);
-	if (bc->skb)
-		dev_kfree_skb(bc->skb);
+	dev_kfree_skb(bc->skb);
 	bc->skb = NULL;
 	printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 	       bc_drvname, dev->base_addr, dev->irq);
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index c6f83e0df0a3..df495b5595f5 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -475,8 +475,7 @@ static int hdlcdrv_close(struct net_device *dev)

 	if (s->ops && s->ops->close)
 		i = s->ops->close(dev);
-	if (s->skb)
-		dev_kfree_skb(s->skb);
+	dev_kfree_skb(s->skb);
 	s->skb = NULL;
 	s->opened = 0;
 	return i;
--
2.23.0