1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/dma.c b/arch/arm/mach-tegra/dma.c
index 250bc7baa00a..4625e3ae766e 100644
--- a/arch/arm/mach-tegra/dma.c
+++ b/arch/arm/mach-tegra/dma.c
@@ -311,6 +311,7 @@ int tegra_dma_enqueue_req(struct tegra_dma_channel *ch,
         struct tegra_dma_req *req)
 {
         unsigned long irq_flags;
+        struct tegra_dma_req *_req;
         int start_dma = 0;
 
         if (req->size > NV_DMA_MAX_TRASFER_SIZE ||
@@ -321,6 +322,13 @@ int tegra_dma_enqueue_req(struct tegra_dma_channel *ch,
 
         spin_lock_irqsave(&ch->lock, irq_flags);
 
+        list_for_each_entry(_req, &ch->list, node) {
+                if (req == _req) {
+                    spin_unlock_irqrestore(&ch->lock, irq_flags);
+                    return -EEXIST;
+                }
+        }
+
         req->bytes_transferred = 0;
         req->status = 0;
         req->buffer_status = 0;