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: Rameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index 9dfa2b0..9cb93c5 100644 (file)
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -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);
        }
 }