Blackfin arch: lookup channel2irq() only once

Add irq to struct dma_channel lookup channel2irq() only once,
since channel2irq() is fairly large on some Blackfin derivatives.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
index 6509733bb0f6..9befcbae00b9 100644
--- a/arch/blackfin/include/asm/dma.h
+++ b/arch/blackfin/include/asm/dma.h
@@ -140,6 +140,7 @@ struct dma_channel {
         struct dma_register *regs;
         struct dmasg *sg;               /* large mode descriptor */
         unsigned int ctrl_num;  /* controller number */
+        unsigned int irq;
         dma_interrupt_t irq_callback;
         void *data;
         unsigned int dma_enable_flag;