Commit b0b79024 authored by Rameshwar Prasad Sahu's avatar Rameshwar Prasad Sahu Committed by Vinod Koul
Browse files

dmaengine: xgene-dma: Fix double IRQ issue by setting IRQ_DISABLE_UNLAZY flag 

For interrupt controller that doesn't support irq_disable and hardware
with level interrupt, an extra interrupt can be pending. This patch fixes
the issue by setting IRQ_DISABLE_UNLAZY flag for the interrupt line.

Reference: http://git.kernel.org/tip/e9849777d0e27cdd2902805be51da73e7c79578c



Signed-off-by: default avatarRameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent b02bab6b

drivers/dma/xgene-dma.c

+4 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/dmapool.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/module.h>

#include <linux/of_device.h>
@@ -1610,6 +1611,7 @@ static int xgene_dma_request_irqs(struct xgene_dma *pdma) 
	/* Register DMA channel rx irq */

	for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {

		chan = &pdma->chan[i];

		irq_set_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);

		ret = devm_request_irq(chan->dev, chan->rx_irq,

				       xgene_dma_chan_ring_isr,

				       0, chan->name, chan);
@@ -1620,6 +1622,7 @@ static int xgene_dma_request_irqs(struct xgene_dma *pdma) 


			for (j = 0; j < i; j++) {

				chan = &pdma->chan[i];

				irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);

				devm_free_irq(chan->dev, chan->rx_irq, chan);

			}
@@ -1640,6 +1643,7 @@ static void xgene_dma_free_irqs(struct xgene_dma *pdma) 


	for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {

		chan = &pdma->chan[i];

		irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);

		devm_free_irq(chan->dev, chan->rx_irq, chan);

	}

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE