From: David Miller <davem@davemloft.net>
To: f.fainelli@gmail.com
Cc: netdev@vger.kernel.org, michael.chan@broadcom.com,
huangjw@broadcom.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] bnxt_en: Fix potential race condition in bnxt_tx_enable()
Date: Fri, 15 Jul 2016 23:20:48 -0700 (PDT) [thread overview]
Message-ID: <20160715.232048.1780795244111833927.davem@davemloft.net> (raw)
In-Reply-To: <1468626125-31732-1-git-send-email-f.fainelli@gmail.com>
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 15 Jul 2016 16:42:01 -0700
> @@ -4599,7 +4599,9 @@ static void bnxt_tx_enable(struct bnxt *bp)
> for (i = 0; i < bp->tx_nr_rings; i++) {
> txr = &bp->tx_ring[i];
> txq = netdev_get_tx_queue(bp->dev, i);
> + __netif_tx_lock(txq, smp_processor_id());
> txr->dev_state = 0;
> + __netif_tx_unlock(txq);
You're going to have to explain how this could possibly cause a
problem, because I'm pretty sure it can't.
Either the reader sees 0, or non-zero, in this value.
And adding locking around this assignment does not change that at all.
next prev parent reply other threads:[~2016-07-16 6:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 23:42 [PATCH net] bnxt_en: Fix potential race condition in bnxt_tx_enable() Florian Fainelli
2016-07-16 6:20 ` David Miller [this message]
2016-07-18 11:34 ` Michael Chan
2016-07-18 20:02 ` [PATCH net] bnxt_en: Remove locking around txr->dev_state Florian Fainelli
2016-07-18 20:06 ` Michael Chan
2016-07-20 2:22 ` David Miller
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