[PATCH v3 08/12] dma: edma: Add one more required slot to MAX slots

[Joel Fernandes]

We'd now need a separate slot just for the channel and separate
ones for the 2 linked sets, so we make adjustments to allocate
an extra channel accordingly.

Signed-off-by: Joel Fernandes <joelf at ti.com>
---
 drivers/dma/edma.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index a242269..df50a04 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -48,7 +48,7 @@
 
 /* Max of 16 segments per channel to conserve PaRAM slots */
 #define MAX_NR_SG		16
-#define EDMA_MAX_SLOTS		MAX_NR_SG
+#define EDMA_MAX_SLOTS		(MAX_NR_SG+1)
 #define EDMA_DESCRIPTORS	16
 
 struct edma_desc {
@@ -311,6 +311,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 
 	num_slots_needed = sg_len > MAX_NR_SG ? MAX_NR_SG : sg_len;
 
+	/* Allocate one extra to account for the channel itself */
+	num_slots_needed++;
+
 	for (i = 0; i < num_slots_needed; i++) {
 		if (echan->slot[i] < 0) {
 			echan->slot[i] =
-- 
1.7.9.5