netdev - Re: [PATCH 2/2] net: ethernet: stmmac: remove private tx queue lock

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Message-Id: <20161207.184111.1365236213357532881.davem@davemloft.net>
Date:   Wed, 07 Dec 2016 18:41:11 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     pavel@....cz
Cc:     LinoSanfilippo@....de, bh74.an@...sung.com, ks.giri@...sung.com,
        vipul.pandya@...sung.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] net: ethernet: stmmac: remove private tx queue lock

From: Pavel Machek <pavel@....cz>
Date: Wed, 7 Dec 2016 22:37:57 +0100

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 982c952..7415bc2 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1308,7 +1308,7 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
>  	unsigned int bytes_compl = 0, pkts_compl = 0;
>  	unsigned int entry = priv->dirty_tx;
>  
> -	spin_lock(&priv->tx_lock);
> +	netif_tx_lock_bh(priv->dev);
>  
>  	priv->xstats.tx_clean++;
>  

stmmac_tx_clean() runs from either the timer or the NAPI poll handler,
both execute from software interrupts, therefore _bh() should be
unnecessary.