linux-kernel - [PATCH] ALSA: line6: fix ifnullfree.cocci warnings

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Date:   Tue, 20 Sep 2016 08:10:13 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Andrej Krutak <dev@...ree.sk>
Cc:     kbuild-all@...org, alsa-devel@...a-project.org,
        Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: line6: fix ifnullfree.cocci warnings

sound/usb/line6/driver.c:484:2-7: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

CC: Andrej Krutak <dev@...ree.sk>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 driver.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -480,8 +480,7 @@ static void line6_destruct(struct snd_ca
 	/* Free buffer memory first. We cannot depend on the existence of private
 	 * data from the (podhd) module, it may be gone already during this call
 	 */
-	if (line6->buffer_message)
-		kfree(line6->buffer_message);
+	kfree(line6->buffer_message);
 
 	kfree(line6->buffer_listen);