netdev - Re: [PATCH] stmmac: Don't access tx_q->dirty_tx before netif_tx

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Date:   Sun, 22 Oct 2017 03:25:05 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     bernd.edlinger@...mail.de
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] stmmac: Don't access tx_q->dirty_tx before
 netif_tx_lock

From: Bernd Edlinger <bernd.edlinger@...mail.de>
Date: Sat, 21 Oct 2017 06:51:30 +0000

> This is the possible reason for different hard to reproduce
> problems on my ARMv7-SMP test system.
> 
> The symptoms are in recent kernels imprecise external aborts,
> and in older kernels various kinds of network stalls and
> unexpected page allocation failures.
> 
> My testing indicates that the trouble started between v4.5 and v4.6
> and prevails up to v4.14.
> 
> Using the dirty_tx before acquiring the spin lock is clearly
> wrong and was first introduced with v4.6.
> 
> Fixes: e3ad57c96715 ("stmmac: review RX/TX ring management")
> 
> Signed-off-by: Bernd Edlinger <bernd.edlinger@...mail.de>

Applied, thank you.