netdev - Re: [PATCH net-next 2/6] atl1c: remove private tx lock

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Message-ID: <20160424220529.GA29377@electric-eye.fr.zoreil.com>
Date:	Mon, 25 Apr 2016 00:05:29 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Florian Westphal <fw@...len.de>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jay Cliburn <jcliburn@...il.com>,
	Chris Snook <chris.snook@...il.com>
Subject: Re: [PATCH net-next 2/6] atl1c: remove private tx lock

Florian Westphal <fw@...len.de> :
[...]
> diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> index d0084d4..a3200ea 100644
> --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
[...]
> @@ -2217,16 +2215,10 @@ static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
>  	}
>  
>  	tpd_req = atl1c_cal_tpd_req(skb);
> -	if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
> -		if (netif_msg_pktdata(adapter))
> -			dev_info(&adapter->pdev->dev, "tx locked\n");
> -		return NETDEV_TX_LOCKED;
> -	}
>  
>  	if (atl1c_tpd_avail(adapter, type) < tpd_req) {
>  		/* no enough descriptor, just stop queue */
>  		netif_stop_queue(netdev);
> -		spin_unlock_irqrestore(&adapter->tx_lock, flags);
>  		return NETDEV_TX_BUSY;
>  	}
>

Play it safe and keep the implicit local_irq_{save / restore} call ?

It may not be needed but it will help avoiding any unexpected regression
report pointing at the NETDEV_TX_LOCKED removal change.

-- 
Ueimor