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Message-ID: <20071114214543.GC9901@kroah.com>
Date: Wed, 14 Nov 2007 13:45:43 -0800
From: Greg KH <greg@...ah.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Shannon Nelson <shannon.nelson@...el.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
hskinnemoen@...el.com, stable@...nel.org
Subject: Re: [stable] [PATCH] dmaengine: Fix broken device refcounting
On Wed, Nov 07, 2007 at 11:46:07AM -0700, Dan Williams wrote:
> From: Haavard Skinnemoen <hskinnemoen@...el.com>
>
> When a DMA device is unregistered, its reference count is decremented
> twice for each channel: Once dma_class_dev_release() and once in
> dma_chan_cleanup(). This may result in the DMA device driver's
> remove() function completing before all channels have been cleaned
> up, causing lots of use-after-free fun.
>
> Fix it by incrementing the device's reference count twice for each
> channel during registration.
>
> Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
> [dan.j.williams@...el.com: kill unnecessary client refcounting]
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Shannon Nelson <shannon.nelson@...el.com>
> Cc: stable@...nel.org
I don't see this in Linus's tree yet, right?
When it goes in, can you resend it to the stable@...nel.org people?
thanks,
greg k-h
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