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| author | Lars-Peter Clausen <lars@metafoo.de> | 2016-07-01 17:45:58 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-07-01 22:56:41 +0530 |
| commit | 71831f652968f05270ace83a0bfd607bfed20760 (patch) | |
| tree | 7d47c528405f2714ef630a41ee16a46f2bd745cf | |
| parent | 50dc60a25597e10a731c8a0813cb3e88db345f54 (diff) | |
| download | op-kernel-dev-71831f652968f05270ace83a0bfd607bfed20760.zip op-kernel-dev-71831f652968f05270ace83a0bfd607bfed20760.tar.gz | |
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>
| -rw-r--r-- | drivers/dma/dma-axi-dmac.c | 3 |
1 files changed, 3 insertions, 0 deletions
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 @@ 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); |
