[PATCH net] net: stmmac: Avoid DMA_CHAN_CONTROL write if no Split Header support

[patchwork-bot+netdevbpf at kernel.org]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem at davemloft.net>:

On Fri, 26 Nov 2021 16:51:15 +0100 you wrote:
> The driver assumes that split headers can be enabled/disabled without
> stopping/starting the device, so it writes DMA_CHAN_CONTROL from
> stmmac_set_features().  However, on my system (IP v5.10a without Split
> Header support), simply writing DMA_CHAN_CONTROL when DMA is running
> (for example, with the commands below) leads to a TX watchdog timeout.
> 
>  host$ socat TCP-LISTEN:1024,fork,reuseaddr - &
>  device$ ethtool -K eth0 tso off
>  device$ ethtool -K eth0 tso on
>  device$ dd if=/dev/zero bs=1M count=10 | socat - TCP4:host:1024
>  <tx watchdog timeout>
> 
> [...]

Here is the summary with links:
  - [net] net: stmmac: Avoid DMA_CHAN_CONTROL write if no Split Header support
    https://git.kernel.org/netdev/net/c/f8e7dfd6fdab

You are awesome, thank you!
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