linux-kernel - RE: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

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Message-ID: <F0A3125A154C5B46B8540D5E65D671050153356A@captain.hq.farsitecommunications.com>
Date:	Wed, 21 Dec 2011 08:33:33 -0000
From:	"Kevin Curtis" <kevin.curtis@...site.com>
To:	"Ben Hutchings" <ben@...adent.org.uk>,
	"David Miller" <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

Hi,
    Thanks for the patches.  I will apply them to the master copy of the source code here.


Regards


Kevin Curtis
Linux Development
FarSite Communications Ltd http://www.farsite.com
Winner of The Queen's Award for Enterprise 2009
tel:  +44 1256 330461
fax:  +44 1256 854931



-----Original Message-----
From: Ben Hutchings [mailto:ben@...adent.org.uk] 
Sent: 21 December 2011 05:41
To: David Miller
Cc: Kevin Curtis; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] farsync: Fix confusion about DMA address and buffer offset types

On Tue, 2011-12-20 at 23:46 -0500, David Miller wrote:
> From: Ben Hutchings <ben@...adent.org.uk>
> Date: Wed, 21 Dec 2011 01:32:52 +0000
> 
> > -	dbg(DBG_RX, "In fst_rx_dma %lx %lx %d\n",
> > -	    (unsigned long) skb, (unsigned long) mem, len);
> > +	dbg(DBG_RX, "In fst_rx_dma %x %x %d\n", (u32)skb, mem, len);
> 
> This is more appropriately fixed by using "%p" instead of casting to a 
> 32-bit int.

'skb' is the physical address of the data in the skb.  Whereas 'mem' is the offset of the corresponding buffer in shared memory.

All completely clear, right? ;-)

Ben.

--
Ben Hutchings
Humans are not rational beings; they are rationalising beings.