linux-kernel - Re: [PATCH] ieee802154-atusb: Delete an unnecessary check before the function call "kfree

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Message-ID: <566A00A5.8030806@osg.samsung.com>
Date:	Thu, 10 Dec 2015 23:45:57 +0100
From:	Stefan Schmidt <stefan@....samsung.com>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Alexander Aring <alex.aring@...il.com>, linux-wpan@...r.kernel.org,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] ieee802154-atusb: Delete an unnecessary check before the
 function call "kfree_skb"

Hello.

On 10/12/15 19:16, Marcel Holtmann wrote:
> Hi Stefan,
>
>>>> From: Markus Elfring <elfring@...rs.sourceforge.net>
>>>> Date: Mon, 16 Nov 2015 13:50:23 +0100
>>>>
>>>> The kfree_skb() function tests whether its argument is NULL and then
>>>> returns immediately. Thus the test around the call is not needed.
>>>>
>>>> This issue was detected by using the Coccinelle software.
>>>>
>>>> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
>>>> ---
>>>> drivers/net/ieee802154/atusb.c | 3 +--
>>>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
>>>> index 199a94a..b1cd865 100644
>>>> --- a/drivers/net/ieee802154/atusb.c
>>>> +++ b/drivers/net/ieee802154/atusb.c
>>>> @@ -310,8 +310,7 @@ static void atusb_free_urbs(struct atusb *atusb)
>>>>          urb = usb_get_from_anchor(&atusb->idle_urbs);
>>>>          if (!urb)
>>>>              break;
>>>> -        if (urb->context)
>>>> -            kfree_skb(urb->context);
>>>> +        kfree_skb(urb->context);
>>>>          usb_free_urb(urb);
>>>>      }
>>>> }
>>> Acked-by: Stefan Schmidt <stefan@....samsung.com>
>>
>> You got the original patch and my ACK on this one or would you prefer me to resend it again?
> this slipped through, but now it does no longer apply.
>
> Applying: ieee802154-atusb: Delete an unnecessary check before the function call "kfree_skb"
> error: patch failed: drivers/net/ieee802154/atusb.c:310
> error: drivers/net/ieee802154/atusb.c: patch does not apply
> Patch failed at 0001 ieee802154-atusb: Delete an unnecessary check before the function call "kfree_skb"

Not good. I did another resend, this one applied, compiled and worked 
fine for me. You will be in the to line.

regards
Stefan Schmidt

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