linux-kernel - Re: [PATCH] net_dma: fix memory leak in dma_pin_iocvec

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Message-ID: <CAPcyv4j5O-5n4YxC7qd05e_fniaofjf=8yfnqoehfJNYumZB4w@mail.gmail.com>
Date:	Tue, 23 Sep 2014 23:27:06 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Roman Gushchin <klamm@...dex-team.ru>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net_dma: fix memory leak in dma_pin_iocvec_pages

On Tue, Sep 23, 2014 at 9:57 PM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Wed, Sep 03, 2014 at 01:28:59PM +0400, Roman Gushchin wrote:
>> dma_pin_iovec_pages() calls get_user_pages() for each iovec. If
>> get_user_pages() returns a number smaller than the requested number,
>> dma_pin_iovec_pages() calls dma_unpin_iovec_pages(). It releases
>> previously allocated iovecs, but pages pinned by last get_user_pages()
>> call remain unreleased.
>> Fix this by calling put_page() for each such page.
>>
> Applied, thanks

Vinod, I have a patch in my queue that completely removes the remnants
of NET_DMA.  It's been deprecated for more than a few cycles now
without any reports to reinstate it.  Time to push the final removal
patch.  I'll rebase it on top of this so it doesn't collide.
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