A couple of hardware registers need to be set to reflect which interrupts have been allocated to the device. Each register is 32-bit wide and can receive four 8-bit values. If we provide any other interrupt number than four, the irq_num variable will never be 0 within the while check and the while block will loop forever.
There is an easy way to prevent this: just break the for loop when we reach "irq_num == 0", which anyway means all interrupts have been processed.
Cc: stable@vger.kernel.org Fixes: 17ce252266c7 ("dmaengine: xilinx: xdma: Add xilinx xdma driver") Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com --- drivers/dma/xilinx/xdma.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c index 93ee298d52b8..359123526dd0 100644 --- a/drivers/dma/xilinx/xdma.c +++ b/drivers/dma/xilinx/xdma.c @@ -668,6 +668,8 @@ static int xdma_set_vector_reg(struct xdma_device *xdev, u32 vec_tbl_start, val |= irq_start << shift; irq_start++; irq_num--; + if (!irq_num) + break; }
/* write IRQ register */