linux-kernel - RE: [net-next PATCH v5 4/5] net: ethernet: stmicro: stmmac: generate stmmac dma conf before open

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Date:   Wed, 14 Jun 2023 13:48:40 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Christian Marangi <ansuelsmth@...il.com>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jose Abreu <Jose.Abreu@...opsys.com>
Subject: RE: [net-next PATCH v5 4/5] net: ethernet: stmicro: stmmac: generate
 stmmac dma conf before open

From: Christian Marangi <ansuelsmth@...il.com>
Date: Wed, Jun 14, 2023 at 03:16:08

> I'm not following the meaning of leak here. If it's intended as a memory
> leak then dma_conf is correctly freed in the 2 user of __stmmac_open.
> 
> stmmac_init_phy also doesn't seems to use dma_conf. Am I missing
> something here?
> 

Sorry, I should have been clearer: It's not leaking the dma_conf per-se but
the contents of it: The DMA descriptors. Since the memcpy() is only done after
init_phy(); if init_phy() fails, then stmmac will never free up the DMA descriptors.

Does it make sense?

Thanks,
Jose