netdev - Re: [PATCH] net: korina: free array used for rx/tx descriptors

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Message-ID: <20201011212135.GD8773@valentin-vidic.from.hr>
Date:   Sun, 11 Oct 2020 23:21:35 +0200
From:   Valentin Vidić <vvidic@...entin-vidic.from.hr>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Philip Rischel <rischelp@....com>,
        Florian Fainelli <florian@...nwrt.org>,
        Roman Yeryomin <roman@...em.lv>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Martin Habets <mhabets@...arflare.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: korina: free array used for rx/tx descriptors

On Sun, Oct 11, 2020 at 02:37:33PM -0400, Willem de Bruijn wrote:
> Slightly off-topic, but I don't fully fathom what goes on with this
> pointer straight after the initial kmalloc.
> 
>         lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);

KSEG1ADDR should rewrite the memory address into the uncached region
for memory mapped I/O. Not sure if this would case problems for kfree
since there is another kfree on the fail path:

probe_err_register:
        kfree(lp->td_ring);

-- 
Valentin