linux-kernel - [PATCH 4/9] [media] tm6000: One function call less in tm6000_usb

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Date:   Fri, 15 Sep 2017 09:51:49 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-media@...r.kernel.org, Andi Shyti <andi.shyti@...sung.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        Bhumika Goyal <bhumirks@...il.com>,
        Christophe Jaillet <christophe.jaillet@...adoo.fr>,
        David Härdeman <david@...deman.nu>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Santosh Kumar Singh <kumar.san1093@...il.com>,
        Sean Young <sean@...s.org>,
        Wei Yongjun <weiyongjun1@...wei.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 4/9] [media] tm6000: One function call less in
 tm6000_usb_probe() after error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 14 Sep 2017 16:11:55 +0200

* Adjust jump targets so that the function "kfree" will be always called
  with a non-null pointer.

* Delete an initialisation for the local variable "dev"
  which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/media/usb/tm6000/tm6000-cards.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/media/usb/tm6000/tm6000-cards.c b/drivers/media/usb/tm6000/tm6000-cards.c
index e18632056976..77347541904d 100644
--- a/drivers/media/usb/tm6000/tm6000-cards.c
+++ b/drivers/media/usb/tm6000/tm6000-cards.c
@@ -1184,7 +1184,7 @@ static int tm6000_usb_probe(struct usb_interface *interface,
 			    const struct usb_device_id *id)
 {
 	struct usb_device *usbdev;
-	struct tm6000_core *dev = NULL;
+	struct tm6000_core *dev;
 	int i, rc = 0;
 	int nr = 0;
 	char *speed;
@@ -1194,7 +1194,7 @@ static int tm6000_usb_probe(struct usb_interface *interface,
 	/* Selects the proper interface */
 	rc = usb_set_interface(usbdev, 0, 1);
 	if (rc < 0)
-		goto err;
+		goto report_failure;
 
 	/* Check to see next free device and mark as used */
 	nr = find_first_zero_bit(&tm6000_devused, TM6000_MAXBOARDS);
@@ -1312,8 +1312,7 @@ static int tm6000_usb_probe(struct usb_interface *interface,
 	if (!dev->isoc_in.endp) {
 		printk(KERN_ERR "tm6000: probing error: no IN ISOC endpoint!\n");
 		rc = -ENODEV;
-
-		goto err;
+		goto free_device;
 	}
 
 	/* save our data pointer in this interface device */
@@ -1323,16 +1322,16 @@ static int tm6000_usb_probe(struct usb_interface *interface,
 
 	rc = tm6000_init_dev(dev);
 	if (rc < 0)
-		goto err;
+		goto free_device;
 
 	return 0;
 
-err:
+free_device:
+	kfree(dev);
+report_failure:
 	printk(KERN_ERR "tm6000: Error %d while registering\n", rc);
 
 	clear_bit(nr, &tm6000_devused);
-
-	kfree(dev);
 put_device:
 	usb_put_dev(usbdev);
 	return rc;
-- 
2.14.1