[RFC patch] DMAengine/Langwell: unmap IO region in error path

[Hillf Danton]

When setting up the Langwell DMA controller, if error encountered, the newly
mapped IO region should be unmapped.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
 drivers/dma/intel_mid_dma.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
index f653517..4c9a572 100644
--- a/drivers/dma/intel_mid_dma.c
+++ b/drivers/dma/intel_mid_dma.c
@@ -1199,6 +1199,8 @@ static int mid_setup_dma(struct pci_dev *pdev)
 err_engine:
 	free_irq(pdev->irq, dma);
 err_irq:
+	if (dma->mask_reg)
+		iounmap(dma->mask_reg);
 	pci_pool_destroy(dma->dma_pool);
 err_dma_pool:
 	pr_err("ERR_MDMA:setup_dma failed: %d\n", err);
--
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