Commit c2d4bb9d authored Apr 27, 2015 by John Ogness Committed by Greg Kroah-Hartman May 06, 2015

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 <john.ogness@linutronix.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 35a0f950

arch/arm/common/edma.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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));