netdev - Re: [PATCH] net: apple: mace: Fix build since dev

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Date:   Thu, 13 Jan 2022 20:21:37 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] net: apple: mace: Fix build since dev_addr
 constification

On Fri, 14 Jan 2022 14:12:52 +1100 Michael Ellerman wrote:
> Since commit adeef3e32146 ("net: constify netdev->dev_addr") the mace
> driver no longer builds with various errors (pmac32_defconfig):
> 
>   linux/drivers/net/ethernet/apple/mace.c: In function ‘mace_probe’:
>   linux/drivers/net/ethernet/apple/mace.c:170:20: error: assignment of read-only location ‘*(dev->dev_addr + (sizetype)j)’
>     170 |   dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j];
>         |                    ^
>   linux/drivers/net/ethernet/apple/mace.c: In function ‘mace_reset’:
>   linux/drivers/net/ethernet/apple/mace.c:349:32: warning: passing argument 2 of ‘__mace_set_address’ discards ‘const’ qualifier from pointer target type
>     349 |     __mace_set_address(dev, dev->dev_addr);
>         |                             ~~~^~~~~~~~~~
>   linux/drivers/net/ethernet/apple/mace.c:93:62: note: expected ‘void *’ but argument is of type ‘const unsigned char *’
>      93 | static void __mace_set_address(struct net_device *dev, void *addr);
>         |                                                        ~~~~~~^~~~
>   linux/drivers/net/ethernet/apple/mace.c: In function ‘__mace_set_address’:
>   linux/drivers/net/ethernet/apple/mace.c:388:36: error: assignment of read-only location ‘*(dev->dev_addr + (sizetype)i)’
>     388 |  out_8(&mb->padr, dev->dev_addr[i] = p[i]);
>         |                                    ^
> 
> Fix it by making the modifications to a local macaddr variable and then
> passing that to eth_hw_addr_set(), as well as adding some missing const
> qualifiers.
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Reviewed-by: Jakub Kicinski <kuba@...nel.org>