From: John Ogness Date: Mon, 27 Apr 2015 11:52:15 +0000 (+0200) Subject: ARM: common: edma: clear completion interrupts on stop X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c2d4bb9d9387231f5e265d59600aeb6409be8e7a;p=openwrt%2Fstaging%2Fblogic.git 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 Acked-by: Peter Ujfalusi Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 5662a872689b..873dbfcc7dc9 100644 --- a/arch/arm/common/edma.c +++ b/arch/arm/common/edma.c @@ -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));