ARM: common: edma: clear completion interrupts on stop

When stopping a DMA transfer with interrupts disabled it is possible that the DMA transfer completes before the events are cleared. In this case the completion interrupt will be pending, causing a completion callback after the transfer was stopped.

By clearing the completion interrupt for the stopping channel it is ensured that no completion event will be generated after the stop.

Signed-off-by John Ogness <[email protected]>

---
 arch/arm/common/edma.c |    3 +++
 1 file changed, 3 insertions(+)

arch/arm/common/edma.c +3 -0

index 5662a87..873dbfc 100644
@@ -1350,6 +1350,9 @@ void edma_stop(unsigned channel)
 		edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
 		edma_write_array(ctlr, EDMA_EMCR, j, mask);
 
+		/* clear possibly pending completion interrupt */
+		edma_shadow0_write_array(ctlr, SH_ICR, j, mask);
+
 		pr_debug("EDMA: EER%d %08x\n", j,
 				edma_shadow0_read_array(ctlr, SH_EER, j));