[RFC patch] DMA engine/Langwell: release LLI pool

[Hillf Danton]

When releasing resources allocated before for DMA channel, checking LLI pool is
added and it is reclaimed if still available.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
 drivers/dma/intel_mid_dma.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
index f653517..4c758fc 100644
--- a/drivers/dma/intel_mid_dma.c
+++ b/drivers/dma/intel_mid_dma.c
@@ -833,6 +833,10 @@ static void
intel_mid_dma_free_chan_resources(struct dma_chan *chan)
 	midc->descs_allocated = 0;
 	list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
 		list_del(&desc->desc_node);
+		if (desc->lli != NULL) {
+			pci_pool_free(desc->lli_pool, desc->lli, desc->lli_phys);
+			pci_pool_destroy(desc->lli_pool);
+		}
 		pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
 	}
 	list_for_each_entry_safe(desc, _desc, &midc->free_list, desc_node) {
@@ -841,6 +845,10 @@ static void
intel_mid_dma_free_chan_resources(struct dma_chan *chan)
 	}
 	list_for_each_entry_safe(desc, _desc, &midc->queue, desc_node) {
 		list_del(&desc->desc_node);
+		if (desc->lli != NULL) {
+			pci_pool_free(desc->lli_pool, desc->lli, desc->lli_phys);
+			pci_pool_destroy(desc->lli_pool);
+		}
 		pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
 	}
 	spin_unlock_bh(&midc->lock);
--
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