dmaengine fixes for 4.8-rc5

The fixes this time are all in drivers:
  o possible NULL dereference in img-mdc
  o correct device identity for free_irq in at_xdmac
  o missing of_node_put() in fsl probe
  o fix debug log and hotchain corner case for pxa-dma
  o fix checking hardware bits in isr in usb dmac
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Merge tag 'dmaengine-fix-4.8-rc5' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine fixes from Vinod Koul:
 "The fixes this time are all in drivers:

   - possible NULL dereference in img-mdc
   - correct device identity for free_irq in at_xdmac
   - missing of_node_put() in fsl probe
   - fix debug log and hotchain corner case for pxa-dma
   - fix checking hardware bits in isr in usb dmac"

* tag 'dmaengine-fix-4.8-rc5' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: img-mdc: fix a possible NULL dereference
  dmaengine: at_xdmac: fix to pass correct device identity to free_irq()
  dmaengine: fsl_raid: add missing of_node_put() in fsl_re_probe()
  dmaengine: pxa_dma: fix debug message
  dmaengine: pxa_dma: fix hotchain corner case
  dmaengine: usb-dmac: check CHCR.DE bit in usb_dmac_isr_channel()

drivers/dma/at_xdmac.c

@@ -2067,7 +2067,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
 err_clk_disable:
 	clk_disable_unprepare(atxdmac->clk);
 err_free_irq:
-	free_irq(atxdmac->irq, atxdmac->dma.dev);
+	free_irq(atxdmac->irq, atxdmac);
 	return ret;
 }
 
@@ -2081,7 +2081,7 @@ static int at_xdmac_remove(struct platform_device *pdev)
 	dma_async_device_unregister(&atxdmac->dma);
 	clk_disable_unprepare(atxdmac->clk);
 
-	free_irq(atxdmac->irq, atxdmac->dma.dev);
+	free_irq(atxdmac->irq, atxdmac);
 
 	for (i = 0; i < atxdmac->dma.chancnt; i++) {
 		struct at_xdmac_chan *atchan = &atxdmac->chan[i];

drivers/dma/fsl_raid.c

@@ -836,6 +836,7 @@ static int fsl_re_probe(struct platform_device *ofdev)
 		rc = of_property_read_u32(np, "reg", &off);
 		if (rc) {
 			dev_err(dev, "Reg property not found in JQ node\n");
+			of_node_put(np);
 			return -ENODEV;
 		}
 		/* Find out the Job Rings present under each JQ */

drivers/dma/img-mdc-dma.c

@@ -861,7 +861,6 @@ static int mdc_dma_probe(struct platform_device *pdev)
 {
 	struct mdc_dma *mdma;
 	struct resource *res;
-	const struct of_device_id *match;
 	unsigned int i;
 	u32 val;
 	int ret;
@@ -871,8 +870,7 @@ static int mdc_dma_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, mdma);
 
-	match = of_match_device(mdc_dma_of_match, &pdev->dev);
+	mdma->soc = of_device_get_match_data(&pdev->dev);
-	mdma->soc = match->data;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mdma->regs = devm_ioremap_resource(&pdev->dev, res);

drivers/dma/pxa_dma.c

@@ -638,7 +638,7 @@ static bool pxad_try_hotchain(struct virt_dma_chan *vc,
 		vd_last_issued = list_entry(vc->desc_issued.prev,
 					    struct virt_dma_desc, node);
 		pxad_desc_chain(vd_last_issued, vd);
-		if (is_chan_running(chan) || is_desc_completed(vd_last_issued))
+		if (is_chan_running(chan) || is_desc_completed(vd))
 			return true;
 	}
 
@@ -671,6 +671,7 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
 	struct virt_dma_desc *vd, *tmp;
 	unsigned int dcsr;
 	unsigned long flags;
+	bool vd_completed;
 	dma_cookie_t last_started = 0;
 
 	BUG_ON(!chan);
@@ -681,15 +682,17 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
 
 	spin_lock_irqsave(&chan->vc.lock, flags);
 	list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) {
+		vd_completed = is_desc_completed(vd);
 		dev_dbg(&chan->vc.chan.dev->device,
-			"%s(): checking txd %p[%x]: completed=%d\n",
+			"%s(): checking txd %p[%x]: completed=%d dcsr=0x%x\n",
-			__func__, vd, vd->tx.cookie, is_desc_completed(vd));
+			__func__, vd, vd->tx.cookie, vd_completed,
+			dcsr);
 		last_started = vd->tx.cookie;
 		if (to_pxad_sw_desc(vd)->cyclic) {
 			vchan_cyclic_callback(vd);
 			break;
 		}
-		if (is_desc_completed(vd)) {
+		if (vd_completed) {
 			list_del(&vd->node);
 			vchan_cookie_complete(vd);
 		} else {

drivers/dma/sh/usb-dmac.c

@@ -600,27 +600,30 @@ static irqreturn_t usb_dmac_isr_channel(int irq, void *dev)
 {
 	struct usb_dmac_chan *chan = dev;
 	irqreturn_t ret = IRQ_NONE;
-	u32 mask = USB_DMACHCR_TE;
+	u32 mask = 0;
-	u32 check_bits = USB_DMACHCR_TE | USB_DMACHCR_SP;
 	u32 chcr;
+	bool xfer_end = false;
 
 	spin_lock(&chan->vc.lock);
 
 	chcr = usb_dmac_chan_read(chan, USB_DMACHCR);
-	if (chcr & check_bits)
+	if (chcr & (USB_DMACHCR_TE | USB_DMACHCR_SP)) {
-		mask |= USB_DMACHCR_DE | check_bits;
+		mask |= USB_DMACHCR_DE | USB_DMACHCR_TE | USB_DMACHCR_SP;
+		if (chcr & USB_DMACHCR_DE)
+			xfer_end = true;
+		ret |= IRQ_HANDLED;
+	}
 	if (chcr & USB_DMACHCR_NULL) {
 		/* An interruption of TE will happen after we set FTE */
 		mask |= USB_DMACHCR_NULL;
 		chcr |= USB_DMACHCR_FTE;
 		ret |= IRQ_HANDLED;
 	}
-	usb_dmac_chan_write(chan, USB_DMACHCR, chcr & ~mask);
+	if (mask)
+		usb_dmac_chan_write(chan, USB_DMACHCR, chcr & ~mask);
 
-	if (chcr & check_bits) {
+	if (xfer_end)
 		usb_dmac_isr_transfer_end(chan);
-		ret |= IRQ_HANDLED;
-	}
 
 	spin_unlock(&chan->vc.lock);