diff options
| -rw-r--r-- | arch/arm/mach-tegra/dma.c | 8 |
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; |