netdev - Re: [BUG] net: sungem: device driver frees DMA memory with wrong function

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Message-Id: <20181224.143946.1890079755062380899.davem@davemloft.net>
Date:   Mon, 24 Dec 2018 14:39:46 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     clabbe.montjoie@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] net: sungem: device driver frees DMA memory with wrong
 function

From: Corentin Labbe <clabbe.montjoie@...il.com>
Date: Sun, 23 Dec 2018 20:38:21 +0100

> During a boot on a qemu machine, I hit the following problem:
 ...
> After some pr_info, I found that the function triggering this is the pci_unmap_page() in gem_tx().
> So clearly this WARNING() is strange since it says "unmapped as single".

I also went through the code paths and this makes no sense to me either.