>-----Original Message-----
>From: Nelson, Shannon
>Sent: Friday, October 26, 2007 10:00 AM
>To: 'Haavard Skinnemoen'
>Cc: Williams, Dan J; linux-kernel@vger.kernel.org;
>[EMAIL PROTECTED]
>Subject: RE: [PATCH] DMA: Fix broken device refcounting
>
>--
>
>When a channel is removed from dmaengine, too many kref_put() calls
>are made and the device removal happens too soon, usually causing
>a panic.
>
>Signed-off-by: Shannon Nelson <[EMAIL PROTECTED]>
>---
>
> drivers/dma/dmaengine.c | 1 -
> 1 files changed, 0 insertions(+), 1 deletions(-)
>
>diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
>index 8248992..144a1b7 100644
>--- a/drivers/dma/dmaengine.c
>+++ b/drivers/dma/dmaengine.c
>@@ -131,7 +131,6 @@ static void
>dma_async_device_cleanup(struct kref *kref);
> static void dma_class_dev_release(struct class_device *cd)
> {
> struct dma_chan *chan = container_of(cd, struct
>dma_chan, class_dev);
>- kref_put(&chan->device->refcount, dma_async_device_cleanup);
> }
>
> static struct class dma_devclass = {
Of course, to avoid compiler complaints, it might be better as something
like:
static void dma_class_dev_release(struct class_device *cd)
{
- struct dma_chan *chan = container_of(cd, struct dma_chan,
class_dev);
- kref_put(&chan->device->refcount, dma_async_device_cleanup);
+ return;
}
sln
-
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