netdev - Re: [PATCH v2 net] net: enetc: survive memory pressure without crashing

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Message-ID: <20221027105824.1c2157a2@kernel.org>
Date:   Thu, 27 Oct 2022 10:58:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] net: enetc: survive memory pressure without
 crashing

On Wed, 26 Oct 2022 15:13:30 +0300 Vladimir Oltean wrote:
> To fix this problem, memset the DMA coherent area used for RX buffer
> descriptors in enetc_dma_alloc_bdr(). This makes all BDs be "not ready"
> by default, which makes enetc_clean_rx_ring() exit early from the BD
> processing loop when there is no valid buffer available.

IIRC dma_alloc_coherent() always zeros, and I'd guess there is a cocci
script that checks this judging but the number of "fixes" we got for
this in the past.

scripts/coccinelle/api/alloc/zalloc-simple.cocci ?