Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma

Pull slave-dma fixes from Vinod Koul:
 "This request brings you two small fixes.  First one for fixing
  dereference of freed descriptor and second for fixing sdma bindings
  for it to work for imx25.

  I was planning to send this about 10days ago but then I had to proceed
  on my paternity leave and didnt get chance to send this.  Now got a
  bit of time from dady duties :)"

* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  dma: sdma: Add imx25 compatible
  dma: ste_dma40: don't dereference free:d descriptor

Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt

 * Freescale Smart Direct Memory Access (SDMA) Controller for i.MX
 
 Required properties:
-- compatible : Should be "fsl,imx31-sdma", "fsl,imx31-to1-sdma",
-  "fsl,imx31-to2-sdma", "fsl,imx35-sdma", "fsl,imx35-to1-sdma",
-  "fsl,imx35-to2-sdma", "fsl,imx51-sdma", "fsl,imx53-sdma" or
-  "fsl,imx6q-sdma". The -to variants should be preferred since they
-  allow to determnine the correct ROM script addresses needed for
-  the driver to work without additional firmware.
+- compatible : Should be one of
+      "fsl,imx25-sdma"
+      "fsl,imx31-sdma", "fsl,imx31-to1-sdma", "fsl,imx31-to2-sdma"
+      "fsl,imx35-sdma", "fsl,imx35-to1-sdma", "fsl,imx35-to2-sdma"
+      "fsl,imx51-sdma"
+      "fsl,imx53-sdma"
+      "fsl,imx6q-sdma"
+  The -to variants should be preferred since they allow to determnine the
+  correct ROM script addresses needed for the driver to work without additional
+  firmware.
 - reg : Should contain SDMA registers location and length
 - interrupts : Should contain SDMA interrupt
 - #dma-cells : Must be <3>.

drivers/dma/imx-sdma.c

@@ -449,6 +449,7 @@ static const struct of_device_id sdma_dt_ids[] = {
 	{ .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, },
 	{ .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, },
 	{ .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, },
+	{ .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sdma_dt_ids);

drivers/dma/ste_dma40.c

@@ -1641,6 +1641,7 @@ static void dma_tasklet(unsigned long data)
 	struct d40_chan *d40c = (struct d40_chan *) data;
 	struct d40_desc *d40d;
 	unsigned long flags;
+	bool callback_active;
 	dma_async_tx_callback callback;
 	void *callback_param;
 
@@ -1668,6 +1669,7 @@ static void dma_tasklet(unsigned long data)
 	}
 
 	/* Callback to client */
+	callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT);
 	callback = d40d->txd.callback;
 	callback_param = d40d->txd.callback_param;
 
@@ -1690,7 +1692,7 @@ static void dma_tasklet(unsigned long data)
 
 	spin_unlock_irqrestore(&d40c->lock, flags);
 
-	if (callback && (d40d->txd.flags & DMA_PREP_INTERRUPT))
+	if (callback_active && callback)
 		callback(callback_param);
 
 	return;