linux-kernel - Re: [RESEND PATCH 1/1] staging:vt6655: remove checks around dev_kfree

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Message-ID: <20150716085430.GF5784@mwanda>
Date:	Thu, 16 Jul 2015 11:54:30 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Maninder Singh <maninder1.s@...sung.com>
Cc:	"forest@...ttletooquiet.net" <forest@...ttletooquiet.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"gclement@...bob.org" <gclement@...bob.org>,
	"tvboxspy@...il.com" <tvboxspy@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"joe@...ches.com" <joe@...ches.com>,
	PANKAJ MISHRA <pankaj.m@...sung.com>
Subject: Re: [RESEND PATCH 1/1] staging:vt6655: remove checks around
 dev_kfree_skb

On Thu, Jul 16, 2015 at 08:45:06AM +0000, Maninder Singh wrote:
> where we are checking for (pTDInfo->skb), we are using it  in above line.
> and it does not look good, thats why we should remove thse checks and i have suggested
> changes.
> 
> code snippet:-
> -----------------------
> 
> if (pTDInfo->skb_dma && (pTDInfo->skb_dma != pTDInfo->buf_dma))
      ^^^^^^^^^^^^^^^^
This is allocated after ->skb so if ->skb_dma is non-NULL then ->skb is
also non-NULL.

>     dma_unmap_single(&pDevice->pcid->dev, pTDInfo->skb_dma,
>              pTDInfo->skb->len, DMA_TO_DEVICE);

Is this a static checker warning?  If so then it's a false positive.

regards,
dan carpenter

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