dmaengine: ti: k3-udma: Fix the TR initialization for prep_slave_sg

The TR which needs to be initialized for the next sg entry is indexed by
tr_idx and not by the running i counter.

In case any sub element in the SG needs more than one TR, the code would
corrupt an already configured TR.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200824120108.9178-1-peter.ujfalusi@ti.com
Fixes: 6cf668a4 ("dmaengine: ti: k3-udma: Use the TR counter helper for slave_sg and cyclic")
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ti/k3-udma.c

@@ -2059,9 +2059,9 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
 			return NULL;
 		}
 
-		cppi5_tr_init(&tr_req[i].flags, CPPI5_TR_TYPE1, false, false,
-			      CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
-		cppi5_tr_csf_set(&tr_req[i].flags, CPPI5_TR_CSF_SUPR_EVT);
+		cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1, false,
+			      false, CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
+		cppi5_tr_csf_set(&tr_req[tr_idx].flags, CPPI5_TR_CSF_SUPR_EVT);
 
 		tr_req[tr_idx].addr = sg_addr;
 		tr_req[tr_idx].icnt0 = tr0_cnt0;