netdev - Re: [PATCH] net: renesas: sh_eth: Fix freeing wrong tx descriptor

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Date:   Tue, 07 Sep 2021 13:10:06 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     s.shtylyov@....ru, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] net: renesas: sh_eth: Fix freeing wrong tx descriptor

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Tue,  7 Sep 2021 20:29:40 +0900 you wrote:
> The cur_tx counter must be incremented after TACT bit of
> txdesc->status was set. However, a CPU is possible to reorder
> instructions and/or memory accesses between cur_tx and
> txdesc->status. And then, if TX interrupt happened at such a
> timing, the sh_eth_tx_free() may free the descriptor wrongly.
> So, add wmb() before cur_tx++.
> Otherwise NETDEV WATCHDOG timeout is possible to happen.
> 
> [...]

Here is the summary with links:
  - net: renesas: sh_eth: Fix freeing wrong tx descriptor
    https://git.kernel.org/netdev/net/c/0341d5e3d1ee

You are awesome, thank you!
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