linux-kernel - [PATCH] uwb: properly check kthread

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Date:   Wed, 13 Sep 2017 17:06:50 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        "Gustavo A . R . Silva" <garsilva@...eddedor.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH] uwb: properly check kthread_run return value

uwbd_start() calls kthread_run() and checks that the return value is
not NULL. But the return value is not NULL in case kthread_run() fails,
it takes the form of ERR_PTR(-EINTR).

Use IS_ERR() instead.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 drivers/uwb/uwbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uwb/uwbd.c b/drivers/uwb/uwbd.c
index 01c20a260a8b..9f615b303576 100644
--- a/drivers/uwb/uwbd.c
+++ b/drivers/uwb/uwbd.c
@@ -303,7 +303,7 @@ static int uwbd(void *param)
 void uwbd_start(struct uwb_rc *rc)
 {
 	rc->uwbd.task = kthread_run(uwbd, rc, "uwbd");
-	if (rc->uwbd.task == NULL)
+	if (IS_ERR(rc->uwbd.task))
 		printk(KERN_ERR "UWB: Cannot start management daemon; "
 		       "UWB won't work\n");
 	else
-- 
2.14.1.581.gf28d330327-goog