[RFC patch resend] DMAengine/Langwell: put tx descriptor in error path

[Hillf Danton]

When preparing LLI based periphral transfer, if error encountered, the newly
prepared tx descriptor should be put for later recycling.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/drivers/dma/intel_mid_dma.c	Sat Aug 13 11:44:46 2011
+++ intel_mid_dma.c	Sat Aug 13 12:32:42 2011
@@ -793,6 +793,7 @@ static struct dma_async_tx_descriptor *i
 				32, 0);
 	if (NULL == desc->lli_pool) {
 		pr_err("MID_DMA:LLI pool create failed\n");
+		midc_desc_put(midc, desc);
 		return NULL;
 	}

@@ -800,6 +801,7 @@ static struct dma_async_tx_descriptor *i
 	if (!desc->lli) {
 		pr_err("MID_DMA: LLI alloc failed\n");
 		pci_pool_destroy(desc->lli_pool);
+		midc_desc_put(midc, desc);
 		return NULL;
 	}
--
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