netdev - RE: [PATCH 2/5] netdev: bfin_mac: fix malformed UDP packet transmission when polling with KGDB

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Message-ID: <0F1B54C89D5F954D8535DB252AF412FA041F17AF@chinexm1.ad.analog.com>
Date:	Sun, 31 May 2009 10:42:32 +0800
From:	"Zhang, Sonic" <Sonic.Zhang@...log.com>
To:	"David Miller" <davem@...emloft.net>, <vapier.adi@...il.com>
CC:	<netdev@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>, <cooloney@...nel.org>
Subject: RE: [PATCH 2/5] netdev: bfin_mac: fix malformed UDP packet transmission when polling with KGDB

SSYNC here is used to make sure the writing to DMA MMR start_addr is
flushed into the registers before start the DMA controller.

Sonic

-----Original Message-----
From: David Miller [mailto:davem@...emloft.net] 
Sent: Friday, May 29, 2009 7:27 PM
To: vapier.adi@...il.com
Cc: netdev@...r.kernel.org; uclinux-dist-devel@...ckfin.uclinux.org;
Zhang, Sonic; cooloney@...nel.org
Subject: Re: [PATCH 2/5] netdev: bfin_mac: fix malformed UDP packet
transmission when polling with KGDB

From: Mike Frysinger <vapier.adi@...il.com>
Date: Fri, 29 May 2009 07:20:18 -0400

> that isnt how the DMA is being used here.  there is no register to 
> read back because the DMA controller is doing the reading indirectly.
> but along those lines, it's not entirely clear which DMA registers 
> this SSYNC is supposed to be protecting because all of the updates are

> happening on the descriptors in external memory, not the DMA registers

> themselves.  i'll have Sonic clarify.

Yes, that's really confusing because the commit message says
"registers".
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