On Tue, Jul 01, 2014 at 06:57:45PM +0100, Joe Perches wrote:
> On Tue, 2014-07-01 at 18:46 +0100, Mark Rutland wrote:
> > On Tue, Jul 01, 2014 at 05:36:49PM +0100, Stefan Wahren wrote:
> > > This patch adds the Ethernet over SPI driver for the
> > > Qualcomm QCA7000 HomePlug GreenPHY.
> []
> > > + memcpy(qca->net_dev->dev_addr, mac, ETH_ALEN);
> >
> > I believe that it is preferred to write:
> >
> > ether_addr_copy(qca->net_dev->dev_addr, mac);
> >
> > I believe checkpatch has a warning for this.
>
> True, but you have to make sure that both args are
> at least __aligned(2) and afaics there's no
> guarantee that's true for mac.
In this case I think there is, though I deleted the context that would
make that clearer. Sorry about that.
We acquired mac with:
mac = of_get_mac_address(spi_device->dev.of_node);
Where of_get_mac_address returns a property::value pointer.
As far as I can tell, when we unflatten the DT each property::value is
pointed at the original data in the DTB. Each data stream immediately
follows a naturally aligned 32-bit FDT_PROP token in the DTB, so all
value pointers should be aligned to at least 4 bytes.
That all said I'm happy to just use memcpy if we're not happy to rely on
the DTB format, it's not exactly going to be a bottleneck.
Cheers,
Mark.
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