commit cbd65312ba6b508e994d40729e84a51301870bcc
author Andy Shevchenko <andriy.shevchenko@linux.intel.com> Wed Jan 09 10:17:11 2013 +0200
committer Vinod Koul <vinod.koul@intel.com> Wed Jan 09 06:30:59 2013 -0800
tree c41f95b7232b93b70df91d96e81c8ed5c85f242b
parent 123de543414bce42da9729071962d4a9512612c8

dw_dmac: check for mapping errors

Otherwise we get a warning in case of CONFIG_DMA_API_DEBUG=y

[   45.775943] WARNING: at lib/dma-debug.c:933 check_unmap+0x5d6/0x6ac()
[   45.782369] dw_dmac dw_dmac.0: DMA-API: device driver failed to check map error[device address=0x00000000356efcc0] [size=28 bytes] [mapped as single]

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/dw_dmac.c

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index c0c9370..dd7a819 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1087,6 +1087,7 @@
 	struct dw_desc		*desc;
 	int			i;
 	unsigned long		flags;
+	int			ret;
 
 	dev_vdbg(chan2dev(chan), "%s\n", __func__);
 
@@ -1110,12 +1111,8 @@
 		spin_unlock_irqrestore(&dwc->lock, flags);
 
 		desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL);
-		if (!desc) {
-			dev_info(chan2dev(chan),
-				"only allocated %d descriptors\n", i);
-			spin_lock_irqsave(&dwc->lock, flags);
-			break;
-		}
+		if (!desc)
+			goto err_desc_alloc;
 
 		INIT_LIST_HEAD(&desc->tx_list);
 		dma_async_tx_descriptor_init(&desc->txd, chan);
@@ -1123,6 +1120,10 @@
 		desc->txd.flags = DMA_CTRL_ACK;
 		desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli,
 				sizeof(desc->lli), DMA_TO_DEVICE);
+		ret = dma_mapping_error(chan2parent(chan), desc->txd.phys);
+		if (ret)
+			goto err_desc_alloc;
+
 		dwc_desc_put(dwc, desc);
 
 		spin_lock_irqsave(&dwc->lock, flags);
@@ -1134,6 +1135,13 @@
 	dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
 
 	return i;
+
+err_desc_alloc:
+	kfree(desc);
+
+	dev_info(chan2dev(chan), "only allocated %d descriptors\n", i);
+
+	return i;
 }
 
 static void dwc_free_chan_resources(struct dma_chan *chan)