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>
diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 0e0dfc0..7f0b9aa 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -270,6 +270,9 @@
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);