Commit 71831f65 authored Jul 01, 2016 by Lars-Peter Clausen Committed by Vinod Koul Jul 01, 2016

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>

parent 50dc60a2

drivers/dma/dma-axi-dmac.c

+3 −0

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