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

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Message-ID: <20161208140846.GA24327@amd>
Date:   Thu, 8 Dec 2016 15:08:46 +0100
From:   Pavel Machek <pavel@....cz>
To:     David Miller <davem@...emloft.net>
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

On Wed 2016-12-07 18:41:11, David Miller wrote:
> 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.

I've tried the test again with netif_tx_lock() (not _bh()) and it
survived for more then four hours. Strange...

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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