netdev - Re: [PATCH] net: emac: Fix napi poll list corruption

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Message-Id: <20170919.162054.1346334879894995770.davem@davemloft.net>
Date:   Tue, 19 Sep 2017 16:20:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     chunkeey@...glemail.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net: emac: Fix napi poll list corruption

From: Christian Lamparter <chunkeey@...glemail.com>
Date: Tue, 19 Sep 2017 19:35:18 +0200

> This patch is pretty much a carbon copy of
> commit 3079c652141f ("caif: Fix napi poll list corruption")
> with "caif" replaced by "emac".
> 
> The commit d75b1ade567f ("net: less interrupt masking in NAPI")
> breaks emac.
> 
> It is now required that if the entire budget is consumed when poll
> returns, the napi poll_list must remain empty.  However, like some
> other drivers emac tries to do a last-ditch check and if there is
> more work it will call napi_reschedule and then immediately process
> some of this new work.  Should the entire budget be consumed while
> processing such new work then we will violate the new caller
> contract.
> 
> This patch fixes this by not touching any work when we reschedule
> in emac.
> 
> Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>

Applied and queued up for -stable, thanks.