On Wed, May 21, 2014 at 11:01:05AM +0530, Vinod Koul wrote:

On Tue, May 13, 2014 at 03:42:58PM +0200, Maxime Ripard wrote:

quoted

Hi Vinod,

On Wed, Apr 30, 2014 at 12:34:08PM +0530, Vinod Koul wrote:

quoted

quoted

+
+static int sun6i_dma_terminate_all(struct sun6i_vchan *vchan)
+{
+	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
+	struct sun6i_pchan *pchan = vchan->phy;
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock(&sdev->lock);
+	list_del_init(&vchan->node);
+	spin_unlock(&sdev->lock);
+
+	spin_lock_irqsave(&vchan->vc.lock, flags);
+
+	vchan_get_all_descriptors(&vchan->vc, &head);
+
+	if (pchan) {
+		writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
+		writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
+
+		vchan->phy = NULL;
+		pchan->vchan = NULL;
+		pchan->desc = NULL;
+		pchan->done = NULL;
+	}
+
+	spin_unlock_irqrestore(&vchan->vc.lock, flags);
+
+	vchan_dma_desc_free_list(&vchan->vc, &head);

shouldn't you kill the tasklet as well here?

Just to be clear, which tasklet? vchan's or the driver's?

You need to take care of both. But I suspect if we ensure irq is not triggered
and any pending ones are completed you can simply kill both of the tasklets
happily. See the fixes merged in dmaengine last cycle (hint: patchlog shows what
we need to do)

I still don't get why I should kill the driver tasklet in terminate_all.

The tasklet is common to all the channels, if you kill it, you'll
prevent it from scheduling while other channels might have had a need
for it to actually run.

About the commits themselves, I guess you talk about 9068b032 and
ccc7aad0. Both these commits only fix the remove path, not the
terminate_all one, and both these drivers are not doing anything
related to the tasklet in terminate_all.

Btw just noticed, you *should* use dmaengine: as the subsytem name on the patch
series...

Ok, I will.

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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