[PATCH] net: usb: Delete unnecessary checks before the macro call “dev_kfree_skb”

[PATCH] net: usb: Delete unnecessary checks before the macro call “dev_kfree_skb”

[Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 21 Aug 2019 22:16:02 +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@users.sourceforge.net>
---
 drivers/net/usb/lg-vl600.c | 4 +---
 drivers/net/usb/rtl8150.c  | 6 ++----
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/usb/lg-vl600.c b/drivers/net/usb/lg-vl600.c
index 6c2b3e368efe..217a2d8fa47b 100644
--- a/drivers/net/usb/lg-vl600.c
+++ b/drivers/net/usb/lg-vl600.c
@@ -87,9 +87,7 @@ static void vl600_unbind(struct usbnet *dev, struct usb_interface *intf)
 {
 	struct vl600_state *s = dev->driver_priv;

-	if (s->current_rx_buf)
-		dev_kfree_skb(s->current_rx_buf);
-
+	dev_kfree_skb(s->current_rx_buf);
 	kfree(s);

 	return usbnet_cdc_unbind(dev, intf);
diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index 98f33e270af1..13e51ccf0214 100644
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -586,8 +586,7 @@ static void free_skb_pool(rtl8150_t *dev)
 	int i;

 	for (i = 0; i < RX_SKB_POOL_SIZE; i++)
-		if (dev->rx_skb_pool[i])
-			dev_kfree_skb(dev->rx_skb_pool[i]);
+		dev_kfree_skb(dev->rx_skb_pool[i]);
 }

 static void rx_fixup(unsigned long data)
@@ -946,8 +945,7 @@ static void rtl8150_disconnect(struct usb_interface *intf)
 		unlink_all_urbs(dev);
 		free_all_urbs(dev);
 		free_skb_pool(dev);
-		if (dev->rx_skb)
-			dev_kfree_skb(dev->rx_skb);
+		dev_kfree_skb(dev->rx_skb);
 		kfree(dev->intr_buff);
 		free_netdev(dev->netdev);
 	}
--
2.23.0

Re: [PATCH] net: usb: Delete unnecessary checks before the macro call “dev_kfree_skb”

[David Miller]

From: Markus Elfring <Markus.Elfring@web.de>
Date: Wed, 21 Aug 2019 22:24:16 +0200

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Wed, 21 Aug 2019 22:16:02 +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@users.sourceforge.net>

Applied.