[linux-yocto] [PATCH 11/12] dmaengine: idma64: use local variable to index descriptor

[Tan Jui Nee]

From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

Since a local variable contains the number of hardware desriptors at the
beginning of idma64_desc_fill() we may use it to index the last descriptor as
well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul at intel.com>
(cherry picked from commit 390c49f7174a85d88ec080058d8b5c2e301d3f6b)
Signed-off-by: Tan Jui Nee <jui.nee.tan at intel.com>
---
 drivers/dma/idma64.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/idma64.c b/drivers/dma/idma64.c
index b6c13f9..3cb7b2c 100644
--- a/drivers/dma/idma64.c
+++ b/drivers/dma/idma64.c
@@ -274,10 +274,10 @@ static void idma64_desc_fill(struct idma64_chan *idma64c,
 		struct idma64_desc *desc)
 {
 	struct dma_slave_config *config = &idma64c->config;
-	struct idma64_hw_desc *hw = &desc->hw[desc->ndesc - 1];
+	unsigned int i = desc->ndesc;
+	struct idma64_hw_desc *hw = &desc->hw[i - 1];
 	struct idma64_lli *lli = hw->lli;
 	u64 llp = 0;
-	unsigned int i = desc->ndesc;
 
 	/* Fill the hardware descriptors and link them to a list */
 	do {
@@ -287,7 +287,7 @@ static void idma64_desc_fill(struct idma64_chan *idma64c,
 		desc->length += hw->len;
 	} while (i);
 
-	/* Trigger interrupt after last block */
+	/* Trigger an interrupt after the last block is transfered */
 	lli->ctllo |= IDMA64C_CTLL_INT_EN;
 }
 
-- 
1.9.1