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dmaengine: axi-dmac: Return IRQ_NONE if no IRQs are pending 

Return IRQ_NONE in the interrupt handler when it is called but no IRQs are
pending. This allows the system to recover in case of an interrupt storm
e.g. due to a wrong interrupt configuration setup.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Lars-Peter Clausen 2016-07-01 17:45:58 +02:00 committed by Vinod Koul
parent 50dc60a255
commit 71831f6529
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/dma-axi-dmac.c
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@ -270,6 +270,9 @@ static irqreturn_t axi_dmac_interrupt_handler(int irq, void *devid)
unsigned int pending;
pending = axi_dmac_read(dmac, AXI_DMAC_REG_IRQ_PENDING);
if (!pending)
return IRQ_NONE;
axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_PENDING, pending);
spin_lock(&dmac->chan.vchan.lock);