dmaengine: xilinx: xdma: Fix interrupt vector setting

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: [email protected]
Fixes: 17ce252 ("dmaengine: xilinx: xdma: Add xilinx xdma driver")
Signed-off-by: Miquel Raynal <[email protected]>
Acked-by: Lizhi Hou <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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 */