netdev - [PATCH net-next v2 3/3] usbnet: smsc95xx: Clean up unnecessary BUG

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Date:   Fri, 1 Jul 2022 22:47:53 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        Steve Glendinning <steve.glendinning@...well.net>,
        UNGLinuxDriver@...rochip.com, Oliver Neukum <oneukum@...e.com>,
        Andre Edich <andre.edich@...rochip.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Martyn Welch <martyn.welch@...labora.com>,
        Gabriel Hojda <ghojda@...urs.ro>,
        Christoph Fritz <chf.fritz@...glemail.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>,
        Philipp Rosenberger <p.rosenberger@...bus.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Ferry Toth <fntoth@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH net-next v2 3/3] usbnet: smsc95xx: Clean up unnecessary
 BUG_ON() upon register access

smsc95xx_read_reg() and smsc95xx_write_reg() call BUG_ON() if the
struct usbnet pointer passed in is NULL.

The functions have just been amended to dereference the pointer on
entry.  So the kernel now oopses if the pointer is NULL, eliminating
the need for an explicit BUG_ON().

Signed-off-by: Lukas Wunner <lukas@...ner.de>
---
 drivers/net/usb/smsc95xx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 5458629cf694..bfb58c91db04 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -86,8 +86,6 @@ static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
 	int ret;
 	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 
-	BUG_ON(!dev);
-
 	if (current != pdata->pm_task)
 		fn = usbnet_read_cmd;
 	else
@@ -117,8 +115,6 @@ static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
 	int ret;
 	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 
-	BUG_ON(!dev);
-
 	if (current != pdata->pm_task)
 		fn = usbnet_write_cmd;
 	else
-- 
2.36.1