netdev - Re: [PATCH net-next,v2] net: ethernet: mediatek: ppe: fix busy wait loop

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Message-ID: <YHjaBWdMzrhajq2Q@lunn.ch>
Date:   Fri, 16 Apr 2021 02:27:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next,v2] net: ethernet: mediatek: ppe: fix busy wait
 loop

On Thu, Apr 15, 2021 at 05:11:48PM -0700, Ilya Lipnitskiy wrote:
> The intention is for the loop to timeout if the body does not succeed.
> The current logic calls time_is_before_jiffies(timeout) which is false
> until after the timeout, so the loop body never executes.
> 
> Fix by using readl_poll_timeout as a more standard and less error-prone
> solution.
> 
> Fixes: ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for initializing the PPE")
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
> Cc: Felix Fietkau <nbd@....name>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew