netdev - Re: [net PATCH] atl1c: Fix misuse of netdev_alloc

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Message-ID: <1375057594.3669.64.camel@edumazet-glaptop>
Date:	Sun, 28 Jul 2013 17:26:34 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	David Miller <davem@...emloft.net>,
	luis.henriques@...onical.com, netdev@...r.kernel.org,
	jcliburn@...il.com, stable@...r.kernel.org
Subject: Re: [net PATCH] atl1c: Fix misuse of netdev_alloc_skb in refilling
 rx ring

On Mon, 2013-07-29 at 01:07 +0100, Ben Hutchings wrote:

> Just like many older PCI/PCIe devices.  So what?  pci_map_single() takes
> care of that, just so long as the driver sets the DMA mask correctly.
> In fact, PCI devices have a 32-bit DMA mask by default.

I don't know, maybe the remapping doesn't work if area splits several
pages ?

I mean, why bouncing memory if we can allocate in the right zone in the
first place ?



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