netdev - Re: [PATCH AUTOSEL 5.16 12/19] net: apple: bmac: Fix build since dev

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Message-ID: <20220124075208.24c30dcc@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Mon, 24 Jan 2022 07:52:08 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        "David S . Miller" <davem@...emloft.net>, tanghui20@...wei.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.16 12/19] net: apple: bmac: Fix build since
 dev_addr constification

On Sat, 22 Jan 2022 19:11:05 -0500 Sasha Levin wrote:
> From: Michael Ellerman <mpe@...erman.id.au>
> 
> [ Upstream commit ea938248557a52e231a31f338eac4baee36a8626 ]
> 
> Since commit adeef3e32146 ("net: constify netdev->dev_addr") the bmac
> driver no longer builds with the following errors (pmac32_defconfig):
> 
>   linux/drivers/net/ethernet/apple/bmac.c: In function ‘bmac_probe’:
>   linux/drivers/net/ethernet/apple/bmac.c:1287:20: error: assignment of read-only location ‘*(dev->dev_addr + (sizetype)j)’
>    1287 |   dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j];
>         |                    ^
> 
> Fix it by making the modifications to a local macaddr variable and then
> passing that to eth_hw_addr_set().
> 
> We don't use the existing addr variable because the bitrev8() would
> mutate it, but it is already used unreversed later in the function.

Patches 11 and 12 are another case of prep for netdev->dev_addr
being const in 5.17, we don't need those backported.